Update dev files

[GeorgySk]

• add dev container-related files
• update Python versions
• fix Dockerfile
• update README badges
• update pyptoject.toml according to the latest standard
• bump version to 0.5.5
• exclude Python 3.10 on macOS (Python 3.10 on macos-latest fails with error '/usr/local/opt/gettext/lib/libintl.8.dylib' (no such file) actions/setup-python#948)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.10%. Comparing base (622e42b) to head (a9606cb).
⚠️ Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #39      +/-   ##
==========================================
- Coverage   96.29%   93.10%   -3.19%     
==========================================
  Files           4        4              
  Lines         567      566       -1     
==========================================
- Hits          546      527      -19     
- Misses         21       39      +18     

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