feat: support reading in quotaProjectId for billing

[codyoss]

No description provided.

[codecov]

Codecov Report

Merging #383 into master will decrease coverage by 0.1%.
The diff coverage is 78.84%.

@@             Coverage Diff              @@
##             master     #383      +/-   ##
============================================
- Coverage     79.63%   79.53%   -0.11%     
- Complexity      389      397       +8     
============================================
  Files            27       27              
  Lines          1758     1803      +45     
  Branches        181      188       +7     
============================================
+ Hits           1400     1434      +34     
- Misses          262      269       +7     
- Partials         96      100       +4

Impacted Files	Coverage Δ	Complexity Δ
...p/java/com/google/auth/oauth2/UserCredentials.java	80% <75%> (-0.96%)	31 <2> (+3)
...uth/oauth2/ServiceAccountJwtAccessCredentials.java	75.32% <76.47%> (-0.2%)	38 <3> (+2)
...java/com/google/auth/oauth2/GoogleCredentials.java	61.36% <83.33%> (+3.46%)	10 <2> (+2)	⬆️
.../google/auth/oauth2/ServiceAccountCredentials.java	82.64% <84.61%> (-0.48%)	48 <5> (+1)
...tp/java/com/google/auth/oauth2/UserAuthorizer.java	77.59% <0%> (+0.12%)	20% <0%> (ø)	⬇️
...om/google/auth/appengine/AppEngineCredentials.java	75.47% <0%> (+0.96%)	16% <0%> (ø)	⬇️

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[chingor13]

This one is also unnecessary

[chingor13]

Is this one actually needed?

[codyoss]

I would say yes actually for this one. I moved it to package scope though as to not expose more surface to the api.