style: add Error Prone and suppress existing errors #3621
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Add Errorprone and suppress warnings as appropriate.
I have suppressed a few checks using flags, namely
CheckReturnValue
,ProtoBuilderReturnValueIgnored
andReturnValueIgnored
because the errors looked like false positives/less useful. I've also fixed some errors when it was very straightforward.The suppressed errors can be fixed in later commits/PRs but at least new code is covered.
This PR should be a no-op in term of actual code behaviour and runtime execution.
Fixes #3620 ☕️