feat: generate v1 client

[chingor13]

Towards #24

[codecov]

Codecov Report

Merging #54 into master will not change coverage.
The diff coverage is 76.91%.

@@            Coverage Diff             @@
##             master      #54    +/-   ##
==========================================
  Coverage     76.91%   76.91%            
- Complexity       96      192    +96     
==========================================
  Files             6       12     +6     
  Lines           784     1568   +784     
  Branches          3        6     +3     
==========================================
+ Hits            603     1206   +603     
- Misses          167      334   +167     
- Partials         14       28    +14

Impacted Files	Coverage Δ	Complexity Δ
...secretmanager/v1/SecretManagerServiceSettings.java	12.28% <12.28%> (ø)	2 <2> (?)
.../stub/GrpcSecretManagerServiceCallableFactory.java	37.5% <37.5%> (ø)	3 <3> (?)
...ecretmanager/v1/stub/SecretManagerServiceStub.java	5.55% <5.55%> (ø)	1 <1> (?)
...d/secretmanager/v1/SecretManagerServiceClient.java	63.92% <63.92%> (ø)	45 <45> (?)
...ager/v1/stub/SecretManagerServiceStubSettings.java	82.32% <82.32%> (ø)	24 <24> (?)
...tmanager/v1/stub/GrpcSecretManagerServiceStub.java	96.46% <96.46%> (ø)	21 <21> (?)
... and 2 more

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