feat: add google-cloud-recommender-bom artifact

[chingor13]

Fixes #43

[codecov]

Codecov Report

Merging #44 into master will increase coverage by 0.23%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #44      +/-   ##
============================================
+ Coverage     74.49%   74.73%   +0.23%     
- Complexity       54       73      +19     
============================================
  Files             6        6              
  Lines           396      467      +71     
  Branches          2        2              
============================================
+ Hits            295      349      +54     
- Misses           99      116      +17     
  Partials          2        2

Impacted Files	Coverage Δ	Complexity Δ
...e/cloud/recommender/v1beta1/RecommenderClient.java	73.2% <0%> (+2.47%)	40% <0%> (+19%)	⬆️

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