Adding DictConfig

[SalvatoreZagaria]

Pull Request Description

This pull request includes new features for configuring retry parameters using the DictConfig class.

Summary of Changes:

1. Add Unit Tests for Tenacity's Default Configurations:

   • Introduced a new test class TestRetryDefaults to validate the functionalities of dict_config within tenacity.
   • Created unit tests that cover:
     • Setting, getting, overriding, and deleting configuration attributes.
     • Testing retry behavior with both default and overridden configurations.

2. Refactor Configuration Handling:

   • Removed redundant attribute checks in the __init__ method and simplified its initialization.
   • Added a new get method to access configuration values more explicitly and efficiently.

3. Add Configurable Retry Parameters with DictConfig:

   • Introduced a DictConfig class to manage default retry parameters in a singleton dictionary.
   • Enhanced flexibility by allowing default configurations to be overridden or extended when calling the retry decorator.

This is addressing issue #495

[mergify[bot]]

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[tk512]

I don't think this is an infrastructure we want to offer in tenacity.

Is there another way / a compromise for this to be supported by Tenacity? I think it would be highly useful to have safer retry defaults, for one. Perhaps configurable via pyproject.toml as well.