Introduce typing and run mypy checks - cloes #474

[fizyk]

Chore that needs to be done:

• Add newsfragment pipenv run towncrier create [issue_number].[type].rst

Types are defined in the pyproject.toml, issue_numer either from issue tracker or the Pull request number

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.43% 🎉

Comparison is base (4de00c8) 96.37% compared to head (47cf89e) 96.81%.

❗ Current head 47cf89e differs from pull request most recent head d2dcb13. Consider uploading reports for the commit d2dcb13 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #503      +/-   ##
==========================================
+ Coverage   96.37%   96.81%   +0.43%     
==========================================
  Files           4        5       +1     
  Lines         138      157      +19     
==========================================
+ Hits          133      152      +19     
  Misses          5        5              

Flag	Coverage Δ
elastic-7.17	96.81% <100.00%> (+0.43%)	⬆️
elastic-8.0	?
elastic-8.3	?
elastic-8.4	?
elastic-8.5	?
elastic-8.6	96.81% <100.00%> (+0.43%)	⬆️
elastic-8.8	96.81% <100.00%> (+0.43%)	⬆️
elastic-8.9	96.81% <100.00%> (+0.43%)	⬆️
linux	96.81% <100.00%> (+0.43%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
pytest_elasticsearch/config.py	100.00% <100.00%> (ø)
pytest_elasticsearch/executor.py	91.66% <100.00%> (+0.36%)	⬆️
pytest_elasticsearch/factories.py	98.41% <100.00%> (ø)
pytest_elasticsearch/plugin.py	100.00% <100.00%> (ø)

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