Cleanup in concurrency module and typing

[erlendvollset]

• Merge MainThreadExecutor and ExtendedMainThreadExecutor
• Get rid of some redundant type-ignores

Description

Please describe the change you have made.

Checklist:

• Tests added/updated.
• Documentation updated. Documentation is generated from docstrings - these must be updated according to your change.
  If a new method has been added it should be referenced in cognite.rst in order to generate docs based on its docstring.
• Changelog updated in CHANGELOG.md.
• Version bumped. If triggering a new release is desired, bump the version number in _version.py and pyproject.toml per semantic versioning.

[codecov]

Codecov Report

Merging #1173 (75ff5ad) into master (16542ab) will decrease coverage by 0.12%.
The diff coverage is 90.90%.

❗ Current head 75ff5ad differs from pull request most recent head 1fd76e0. Consider uploading reports for the commit 1fd76e0 to get more accurate results

@@            Coverage Diff             @@
##           master    #1173      +/-   ##
==========================================
- Coverage   90.14%   90.02%   -0.12%     
==========================================
  Files          83       83              
  Lines        9743     9709      -34     
==========================================
- Hits         8783     8741      -42     
- Misses        960      968       +8     

Impacted Files	Coverage Δ
cognite/client/utils/_concurrency.py	90.32% <90.00%> (+5.38%)	⬆️
cognite/client/_api/files.py	97.46% <100.00%> (-0.02%)	⬇️

... and 29 files with indirect coverage changes

[haakonvt]

This will raise when passed a function with a named argument priority though. Probably not a big deal?

Ref.:

if "priority" in inspect.signature(fn).parameters:
    raise TypeError(f"Given function {fn} cannot accept reserved parameter name `priority`")

[erlendvollset]

This will raise when passed a function with a named argument priority though. Probably not a big deal?

Ref.:

if "priority" in inspect.signature(fn).parameters:

    raise TypeError(f"Given function {fn} cannot accept reserved parameter name `priority`")

That's fine.

[haakonvt]

I think we should make it easier for SDK developers on 3.9 and 3.10 to contribute without forcing them to use 3.8 to avoid mypy raising issues upon committing.

On this branch with 3.9 and a fresh poetry install, I get the following issues:

...same with 3.10:

...btw, I see that I've introduced this on master (only accepted by mypy with 3.8):

[haakonvt]

Just linking issue here: #1168

[erlendvollset]

I also think it's fine to require contributors to use python 3.8. But let's deal with this in another PR.

[haakonvt]

Sounds reasonable 😉