GitHub additions

[yevgenykuz]

GitHub additions:

• Add java 17 to CI workflow and update actions versions
• Add code owners config
• Add probot stale config
• Add PR template

[codecov]

Codecov Report

Merging #43 (9dee116) into main (b3b83c1) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main      #43   +/-   ##
=========================================
  Coverage     93.61%   93.61%           
  Complexity       31       31           
=========================================
  Files             4        4           
  Lines            94       94           
  Branches         12       12           
=========================================
  Hits             88       88           
  Misses            1        1           
  Partials          5        5           

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