Merge .pyi type stubs inline (#563)

* Merged types into .py code.

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* Fix: nox -rs generate.

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* Updated CHANGELOG.

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* Use lowest common python version for lint.

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* Fix: don't typeshed.

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* Removed unneeded comment.

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* Simplify OPENSEARCH_URL.

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* Fix: positional ignore_status used as chunk_size.

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* Fix: parse version string.

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* Remove future annotations for Python 3.6.

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* Fix: types in documentation.

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* Improve CHANGELOG text.

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* Re-added missing separator.

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* Remove duplicate licenses.

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* Get rid of Optional[Any].

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* Fix docs with AsyncOpenSearch.

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* Fix: undo comment.

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MANIFEST.in

@@ -5,7 +5,7 @@ include LICENSE
 include MANIFEST.in
 include README.md
 include setup.py
-recursive-include opensearch* py.typed *.pyi
+recursive-include opensearch* py.typed
 
 prune test_opensearch
 recursive-exclude * __pycache__