feat: add v1beta client

[chingor13]

b/180636314

[codecov]

Codecov Report

Merging #158 (dbd0ae2) into master (988319f) will increase coverage by 0.90%.
The diff coverage is 75.77%.

@@             Coverage Diff              @@
##             master     #158      +/-   ##
============================================
+ Coverage     74.09%   75.00%   +0.90%     
- Complexity       52      105      +53     
============================================
  Files             6       12       +6     
  Lines           359      776     +417     
  Branches          1        3       +2     
============================================
+ Hits            266      582     +316     
- Misses           90      187      +97     
- Partials          3        7       +4     

Impacted Files	Coverage Δ	Complexity Δ
...lytics/data/v1beta/stub/BetaAnalyticsDataStub.java	12.50% <12.50%> (ø)	1.00 <1.00> (?)
...alytics/data/v1beta/BetaAnalyticsDataSettings.java	17.94% <17.94%> (ø)	2.00 <2.00> (?)
...eta/stub/GrpcBetaAnalyticsDataCallableFactory.java	37.50% <37.50%> (ø)	3.00 <3.00> (?)
...analytics/data/v1beta/BetaAnalyticsDataClient.java	66.66% <66.66%> (ø)	18.00 <18.00> (?)
...ata/v1beta/stub/BetaAnalyticsDataStubSettings.java	82.00% <82.00%> (ø)	16.00 <16.00> (?)
...cs/data/v1beta/stub/GrpcBetaAnalyticsDataStub.java	92.90% <92.90%> (ø)	13.00 <13.00> (?)
... and 2 more

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