feat(connector): [SCRIPT] Update add connector script with new connector features

[swetasharma03]

Type of Change

• [ ] Bugfix
• [x] New feature
• [x] Enhancement
• [x] Refactoring
• [ ] Dependency updates
• [ ] Documentation
• [ ] CI/CD

Description

• Removed the unwanted changes (like addition of conector_name in RoutableConnectors enum, etc)
• Amount convertor code is generated in the template
• Connector Specification is also added in the template
• Network error codes added
• validate_mandate_payment, validate_psync_reference_id, toml files doesn't directly implements cards as supported payment method
• The unit test file now generated directly to crates/router/tests/connectors etc
• Code getting compiled directly after template generation.
• Derive macro copy added for all unit types like enums which only have 1 type of data (eg payment status, refund status) and structs which only have primitive types like i64, u64 , bool, char or unit structs.

Additional Changes

• [ ] This PR modifies the API contract
• [ ] This PR modifies the database schema
• [ ] This PR modifies application configuration/environment variables

Motivation and Context

How did you test it?

Checklist

• [x] I formatted the code cargo +nightly fmt --all
• [x] I addressed lints thrown by cargo clippy
• [x] I reviewed the submitted code
• [ ] I added unit tests for my changes where possible

[semanticdiff-com[bot]]

Review changes with  

Changed Files

File	Status
crates/hyperswitch_connectors/src/default_implementations.rs	2% smaller
connector-template/mod.rs	Unsupported file format
connector-template/test.rs	Unsupported file format
connector-template/transformers.rs	Unsupported file format
scripts/add_connector.sh	Unsupported file format