chore(nexus): add nexus-staging-maven-plugin for auto staging deployed artifacts

[bednar]

For more info see: https://central.sonatype.org/publish/publish-portal-ossrh-staging-api/#plugins-tested-for-compatibility

Checklist

• Rebased/mergeable
• A test has been added if appropriate
• mvn test completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.51%. Comparing base (0b60015) to head (feba31b).
⚠️ Report is 1 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff            @@
##             master     #833   +/-   ##
=========================================
  Coverage     88.51%   88.51%           
+ Complexity      787      785    -2     
=========================================
  Files           174      174           
  Lines          7207     7207           
  Branches        405      405           
=========================================
  Hits           6379     6379           
  Misses          697      697           
  Partials        131      131           

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