Edx-lint

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* Removed support of LegacyWaffle* checks, since the classes no longer exist.
* Removed deleted pylint messages from common pylintrc file

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* fixed import path of a pylint protected function to make
edx-lint compatible with `pylint==2.13.0`.
* Updated testenvs in both tox and CI

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* Include constraint files when generating requirements metadata

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* Silence the "consider-using-f-string" pylint violation.

* The new "update" command will write all edx-lint-writable files that exist
on disk.

* edx-lint can now write commitlint.config.js files.

* The help message now includes the version.

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* Disabled two new warnings from pylint 2.10: unspecified-encoding and
use-maxsplit-arg.

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* BREAKING CHANGE: Add linter for invalid imports from Django Waffle (`import waffle` and `from waffle import ...`). Instead, developers should import toggle objects from `edx_toggles.toggles`.
* BREAKING CHANGE: Add linter for missing feature toggle annotations ("toggle-missing-annotation"). Check `this howto <https://edx.readthedocs.io/projects/edx-toggles/en/latest/how_to/documenting_new_feature_toggles.html>`__ for more information on writing toggle annotations.
* Fix duplicate annotation errors.