[Core] Add pep8 linter

[Tankilevitch]

User description

Description

What - Added linting for naming convention and pep8 conventions

Why -

How -

Type of change

Please leave one option from the following and delete the rest:

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] New Integration (non-breaking change which adds a new integration)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Non-breaking change (fix of existing functionality that will not change current behavior)
• [ ] Documentation (added/updated documentation)

All tests should be run against the port production environment(using a testing org).

Core testing checklist

• [ ] Integration able to create all default resources from scratch
• [ ] Resync finishes successfully
• [ ] Resync able to create entities
• [ ] Resync able to update entities
• [ ] Resync able to detect and delete entities
• [ ] Scheduled resync able to abort existing resync and start a new one
• [ ] Tested with at least 2 integrations from scratch
• [ ] Tested with Kafka and Polling event listeners
• [ ] Tested deletion of entities that don't pass the selector

Integration testing checklist

• [ ] Integration able to create all default resources from scratch
• [ ] Resync able to create entities
• [ ] Resync able to update entities
• [ ] Resync able to detect and delete entities
• [ ] Resync finishes successfully
• [ ] If new resource kind is added or updated in the integration, add example raw data, mapping and expected result to the examples folder in the integration directory.
• [ ] If resource kind is updated, run the integration with the example data and check if the expected result is achieved
• [ ] If new resource kind is added or updated, validate that live-events for that resource are working as expected
• [ ] Docs PR link here

Preflight checklist

• [ ] Handled rate limiting
• [ ] Handled pagination
• [ ] Implemented the code in async
• [ ] Support Multi account

Screenshots

Include screenshots from your environment showing how the resources of the integration will look.

API Documentation

Provide links to the API documentation used for this integration.

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PR Type

Enhancement, Bug fix, Tests

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Description

• Standardized exception naming by replacing Exception suffix with Error.

• Refactored code to align with PEP8 conventions and added @classmethod decorators.

• Updated pyproject.toml to include naming convention rules and exclude unnecessary directories.

• Adjusted test cases to reflect updated exception names.

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Changes walkthrough 📝

	Relevant files
Bug fix	15 files client.py Renamed exceptions for Kafka credentials handling.              +2/-2      integrations.py Updated exception name for defaults provisioning.                +2/-2      ocean.py Fixed naming convention for webhook manager.                          +1/-1      common.py Renamed exception for unsupported default file types.        +2/-2      factory.py Updated exception for unsupported event listener types.    +2/-2      order_by_entities_dependencies.py Renamed exception for cyclic dependencies.                              +2/-2      jq_entity_processor.py Updated exception for entity processor errors.                      +2/-2      base.py Renamed exception for already started integrations.            +2/-2      handler.py Updated exception for uninitialized handlers.                        +4/-4      sync_raw.py Renamed exception for aborting operations.                              +3/-3      utils.py Updated exception handling for resync operations.                +8/-8      entity_topological_sorter.py Renamed exception for cyclic dependencies in sorting.        +2/-2      utils.py Updated exception for validation errors.                                  +4/-4      middlewares.py Updated middleware exception handling.                                      +3/-3      ocean.py Fixed naming convention for webhook manager.                          +2/-2
Enhancement	12 files settings.py Added `@classmethod` for root validators.                                +4/-0      applier.py Fixed variable naming to align with conventions.                  +4/-4      models.py Fixed naming convention for model fields.                                +1/-1      api.py Renamed API exceptions to align with naming conventions.  +3/-3      base.py Standardized base exception naming.                                            +1/-1      clients.py Renamed client-related exceptions.                                              +3/-3      context.py Updated context-related exceptions.                                            +2/-2      core.py Standardized core exception naming.                                            +10/-10  port_defaults.py Renamed exceptions for port defaults.                                        +4/-4      utils.py Updated signal handler exceptions.                                              +3/-3      handlers.py Fixed method naming convention.                                                    +1/-1      signal.py Renamed signal handler exceptions.                                              +6/-4
Tests	4 files test_jq_entity_processor.py Updated test cases for renamed exceptions.                              +2/-2      test_sync_raw.py Adjusted tests for renamed exceptions.                                      +2/-2      test_utils.py Updated tests for integration runtime validation.                +2/-2      test_entity_topological_sorter.py Adjusted tests for cyclic dependency exceptions.                  +3/-3
Configuration changes	1 files pyproject.toml Added PEP8 naming rules and updated exclusions.                    +11/-3

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