Enforce coding styles

[HEJOK254]

This PR adds coding styles/guidelines and a format action/check

• .editorconfig
• format action
• vs code editorconfig extension workspace recommendation
• format slash command (/format)
• Change action triggers

[deepsource-io]

Here's the code health analysis summary for commits 33d4946..9d731f2. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
C#	✅ Success		View Check ↗

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💡 If you’re a repository administrator, you can configure the quality gates from the settings.

[Filip55561]

Oh god

[HEJOK254]

Actions annotations will report on random changes in commits when affected files weren't changed in commits.
See: actions/toolkit#470

I don't think it's fixable at the moment

[HEJOK254]

/format

[HEJOK254]

i might need to have it on a main branch

[HEJOK254]

I wonder if DeepSource transformers wouldn't do a better job