Get publishing to gradle working with gradle-nexus/publish-plugin

[bobbylight]

With the sonatype changes, change to a different gradle plugin to facilitate publishing to maven central.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.10%. Comparing base (dc5d054) to head (0cc86cb).

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #35   +/-   ##
=========================================
  Coverage     90.10%   90.10%           
  Complexity      634      634           
=========================================
  Files            28       28           
  Lines          1961     1961           
  Branches        376      376           
=========================================
  Hits           1767     1767           
  Misses           79       79           
  Partials        115      115           

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