* test: Switch to unittest.mock from mock

Now that the minimum supported version of Python is 3.7, we can stop
using the external mock requirement, and import it from unittest. I have
also attempted to keep imports ordered.

Fixes #377

* test: Fallback to external mock for AsyncMock

AsyncMock is not included in unittest.mock under Python 3.7, so we must
fallback to the external mock requirement for that Python version. Only
install it for that version.

Keep this as a separate commit so it can be reverted when 3.7 isn't
supported anymore.

* lint

* clean up to satisfy mypy

* lint

* fix build

---------

Co-authored-by: Anthonios Partheniou <[email protected]>

* feat: add support for python 3.13

* Add constraints file

* Avoid Python3.13 warning coroutine method 'aclose' was never awaited

* remove allow-prereleases: true

* exclude grpcio 1.67.0rc1

* add comment

* remove empty line

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* Update comment

Co-authored-by: ohmayr <[email protected]>

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Co-authored-by: ohmayr <[email protected]>

* Update

* Update client_options.py

* Update

* fix build

---------

Co-authored-by: Anthonios Partheniou <[email protected]>

* chore: move retry async check to wrap time

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* added no cover mark

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* feat: optimize _GapicCallable

* cleaned up metadata lines

* chore: avoid type checks in error wrapper

* Revert "chore: avoid type checks in error wrapper"

This reverts commit c97a636.

* add default wrapped function

* fixed decorator order

* fixed spacing

* fixed comment typo

* fixed spacing

* fixed spacing

* removed unneeded helpers

* use caching

* improved metadata parsing

* improved docstring

* fixed logic

* added benchmark test

* update threshold

* run benchmark in loop for testing

* use verbose logs

* Revert testing

* used smaller value

* changed threshold

* removed link in comment

* use list type for metadata

* add types to docstring

* fixed lint

* convert to list at init time

---------

Co-authored-by: Daniel Sanche <[email protected]>
Co-authored-by: Daniel Sanche <[email protected]>

* chore: update templated files

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Co-authored-by: ohmayr <[email protected]>

* Improve Any decoding-error.

Was:

TypeError: Could not convert Any to PredictLongRunningResponse

Now:

TypeError: Could not convert
   Any[google.ai.generativelanguage.v1main.PredictLongRunningResponse] to
       google.ai.generativelanguage.v1beta.PredictLongRunningResponse

* update test

* update error message

* address review feedback

---------

Co-authored-by: Anthonios Partheniou <[email protected]>

This reverts commit 3c69867.

This reverts commit 1695119.

* chore: update templated files

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