metadata, pom signing and catch-all java-sdk module

[blakesteve]

PR for for publishing the sdk jars to maven central

[codecov-io]

Codecov Report

Merging #605 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #605   +/-   ##
=========================================
  Coverage     55.96%   55.96%           
  Complexity     1304     1304           
=========================================
  Files           320      320           
  Lines          6415     6415           
  Branches        421      421           
=========================================
  Hits           3590     3590           
  Misses         2503     2503           
  Partials        322      322

Impacted Files	Coverage Δ	Complexity Δ
...loud/discovery/v1/model/configuration/Heading.java	0% <0%> (ø)	0% <0%> (ø)	❌

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