Maven Central publishing

[janheinrichmerker]

This PR adds the necessary configuration to publish the Java package on the Maven Central Repository.
This simplifies using the library as most dependency management tools (e.g. Gradle) come with Maven Central enabled per default. So users only need to add the implementation("io.tira:tirex-tracker") line to their Gradle config and do no longer need to configure the GitHub Packages repository.

Fixes #24

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.36%. Comparing base (f1b65db) to head (6f43f99).
Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #28   +/-   ##
=========================================
  Coverage     78.36%   78.36%           
  Complexity       20       20           
=========================================
  Files             3        3           
  Lines          1151     1151           
  Branches         53       53           
=========================================
  Hits            902      902           
  Misses          208      208           
  Partials         41       41           

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[TheMrSheldon]

LGTM! Thank you very much :)