feat: revert "feat: deprecate v1beta1 client"

[stephaniewang526]

Reverts #206

[codecov]

Codecov Report

Merging #209 into master will increase coverage by 0.36%.
The diff coverage is 80.04%.

@@             Coverage Diff              @@
##             master     #209      +/-   ##
============================================
+ Coverage     76.59%   76.95%   +0.36%     
- Complexity      185      405     +220     
============================================
  Files            12       24      +12     
  Lines          1602     3532    +1930     
  Branches         16       37      +21     
============================================
+ Hits           1227     2718    +1491     
- Misses          345      745     +400     
- Partials         30       69      +39     

Impacted Files	Coverage Δ	Complexity Δ
.../com/google/cloud/automl/v1beta1/AutoMlClient.java	63.49% <ø> (ø)	98.00 <0.00> (?)
...m/google/cloud/automl/v1beta1/stub/AutoMlStub.java	2.50% <2.50%> (ø)	1.00 <1.00> (?)
...om/google/cloud/automl/v1beta1/AutoMlSettings.java	7.52% <7.52%> (ø)	2.00 <2.00> (?)
...oud/automl/v1beta1/stub/PredictionServiceStub.java	20.00% <20.00%> (ø)	1.00 <1.00> (?)
...loud/automl/v1beta1/PredictionServiceSettings.java	21.21% <21.21%> (ø)	2.00 <2.00> (?)
.../cloud/automl/v1beta1/PredictionServiceClient.java	44.64% <44.64%> (ø)	11.00 <11.00> (?)
...automl/v1beta1/stub/GrpcAutoMlCallableFactory.java	50.00% <50.00%> (ø)	4.00 <4.00> (?)
...ta1/stub/GrpcPredictionServiceCallableFactory.java	50.00% <50.00%> (ø)	4.00 <4.00> (?)
...ml/v1beta1/stub/PredictionServiceStubSettings.java	83.33% <83.33%> (ø)	12.00 <12.00> (?)
...automl/v1beta1/stub/GrpcPredictionServiceStub.java	84.84% <84.84%> (ø)	10.00 <10.00> (?)
... and 14 more

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