ci: add semantic release

[mtrezza]

• adds semantic release for automatic changelog generation and versioning
• added with dry-run mode enabled; just for testing for now
• no pre-release branches; as we are reviving the Parse Android SDK we want timely releases and feedback, so we take the risk of releasing a bug to get faster feedback without letting a release go through a "beta" testing phase

[codecov]

Codecov Report

Merging #1113 (f6e147b) into master (7106bdb) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1113   +/-   ##
=========================================
  Coverage     65.06%   65.06%           
  Complexity     2208     2208           
=========================================
  Files           122      122           
  Lines          9463     9463           
  Branches       1317     1317           
=========================================
  Hits           6157     6157           
  Misses         2799     2799           
  Partials        507      507           

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