Add google-cloud-gameservices client

[chingor13]

No description provided.

[codecov]

Codecov Report

Merging #5711 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #5711 +/- ##
============================================
+ Coverage 46.74% 46.79% +0.05% - Complexity 24664 24993 +329 
============================================
Files 2352 2382 +30 Lines 256327 259161 +2834 Branches 29359 28578 -781 ============================================
+ Hits 119818 121273 +1455 - Misses 127576 128183 +607 - Partials 8933 9705 +772

Impacted Files	Coverage Δ	Complexity Δ
...g/v1alpha/stub/GrpcScalingPoliciesServiceStub.java	91.03% <ø> (ø)	13 <0> (?)
...ng/v1alpha/stub/GameServerClustersServiceStub.java	9.09% <ø> (ø)	1 <0> (?)
...pha/stub/GrpcGameServerDeploymentsServiceStub.java	93.6% <ø> (ø)	18 <0> (?)
.../v1alpha/GameServerDeploymentsServiceSettings.java	9.33% <ø> (ø)	2 <0> (?)
...tub/GrpcScalingPoliciesServiceCallableFactory.java	50% <ø> (ø)	4 <0> (?)
...1alpha/stub/GrpcAllocationPoliciesServiceStub.java	91.03% <ø> (ø)	13 <0> (?)
...ha/stub/AllocationPoliciesServiceStubSettings.java	84.47% <ø> (ø)	18 <0> (?)
.../GrpcGameServerClustersServiceCallableFactory.java	50% <ø> (ø)	4 <0> (?)
...ha/stub/GameServerClustersServiceStubSettings.java	84.47% <ø> (ø)	18 <0> (?)
.../GrpcAllocationPoliciesServiceCallableFactory.java	50% <ø> (ø)	4 <0> (?)
... and 226 more

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[chingor13]

FYI @dzlier-gcp