Use a TypedDict for plugin options config - closes #706

[jaredkeil]

Implemented PostgresqlConfigDict(TypedDict) which has the same keys as the previous config dict. The value types are what is expected from the request.config object after .ini or command line options are parsed, and in general fit the expected usages of config["<some_option>"]. Now, when a variable is set by getting a config value, there is a type hint for that variable. For example:

config = get_config(request)
port = config["port"]
# type hint -- port: str | None

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.09 🎉

Comparison is base (d3c3ba1) 94.27% compared to head (043cfc1) 94.37%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #724      +/-   ##
==========================================
+ Coverage   94.27%   94.37%   +0.09%     
==========================================
  Files          22       22              
  Lines         629      640      +11     
==========================================
+ Hits          593      604      +11     
  Misses         36       36              

Flag	Coverage Δ
linux	66.71% <100.00%> (+0.58%)	⬆️
macos	90.00% <100.00%> (+0.17%)	⬆️

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

Impacted Files	Coverage Δ
pytest_postgresql/config.py	100.00% <100.00%> (ø)

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[fizyk]

@jaredkeil tests fail on python 3.7:

• remove python 3.7 from the CI/package definition, and require at least 3.8
• Add newsfragments (break for dropping python 3.7 support and misc for introducing Typed config dict)
• adjust typing according to mypy issues

[fizyk]

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

[jaredkeil]

Summary of changes which now pass the checks:

• Removed 3.7 from the workflow "Run tests" python-version matrix
• Updated setup.cfg python_requires at least 3.8, removed Python 3.7 lang from classifiers
• Resolved mypy issues by updating config types and return type of get_postgresql_option
• Resolved black issue by adding trailing comma to PostgresqlConfigDict instantiation args
• Changed raw list type of config["load"] to List for older python version
• Added 2 newsfragments, one for break, one for misc, each linked to original issue Review typing #706.

[fizyk]

Thank you @jaredkeil