Advertise shared as being typed, and add vscode settings

[Swatinem]

The main addition here is the py.typed file, which advertises to mypy that this package indeed has type annotations, so downstream users like worker are properly using those.

As another change, this adds some vscode settings with recommended extensions, and sets up ruff to auto-fix/format on-save, which is copied from codecov/worker#706.

[Swatinem]

It seems that I am also running into python/mypy#13392, as I can’t pip install --editable ../shared from worker unfortunately :-(

I am once again hitting the limit of my knowledge of the python ecosystem here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.12%. Comparing base (d26f241) to head (cbae424).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #357      +/-   ##
==========================================
- Coverage   89.78%   89.12%   -0.66%     
==========================================
  Files         375      324      -51     
  Lines       11638     9712    -1926     
  Branches     2063     1737     -326     
==========================================
- Hits        10449     8656    -1793     
+ Misses       1101      992     -109     
+ Partials       88       64      -24     

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