Aiohttp-middlewares

Other:
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- Tweak documentation (60)

Release new version, which supports latest aiohttp 3.8.0 release and ensures support of Python 3.9 & 3.10.

Features:
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- Support latest aiohttp release (55)

Refactoring:
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- Move code to src directory

Other:
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- Update pre-commit hooks
- Massive updates to internal library infrastructure
- Bump pre-commit hooks
- Update config
- Bump github actions to use
- Update library infrastructure
- Update package version
- Update common files
- (**deps-dev**) bump pytest from 6.0.1 to 6.1.0 (29)
- (**deps-dev**) bump coverage from 5.2.1 to 5.3 (28)
- (**deps**) bump aiohttp from 3.6.2 to 3.7.2 (30)
- (**deps-dev**) bump pytest from 6.1.0 to 6.1.2 (31)
- Use Python 3.10 as dev version (52)
- (**deps**) bump actions/checkout from 2.3.4 to 2.3.5 (53)
- Update docs requirements (54)
- Bump requirements for docs (56)
- Switch to Furo theme (57)
- Update Read the Docs configuration (58)

- Provide `get_error_response` coroutine to allow reuse error handling logic in custom middlewares. Usable, when post processing responses (error responses as well) is required and may result in extra errors

- chore: Release **1.0.0** version which highlights updates to error middleware and first class support of `yarl.URL` instances within the library

Full list of changes:

- feature: Provide default error handler and enable it in error middleware
- feature: Allow to ignore exceptions from handling by error middleware
- feature: First class support of `yarl.URL` within all library
- chore: Return empty response for CORS preflight requests

- chore: Make default error handler be available to import from `aiohttp-middlewares` package

- chore: Return empty response for CORS preflight requests