[ggj] Generated classes which implement ResourceName do not use fully qualified names for `java.lang` classes

[BenWhitehead]

Steps to reproduce

1. Attempt to generate gapic client for storage/v2
2. Receive compile error

   [ERROR] .../src/github.com/googleapis/java-storage/proto-google-cloud-storage-v2/src/main/java/com/google/storage/v2/CryptoKeyName.java:[173,3] method does not override or implement a method from a supertype
   [ERROR] .../src/github.com/googleapis/java-storage/proto-google-cloud-storage-v2/src/main/java/com/google/storage/v2/CryptoKeyName.java:[175,11] incomparable types: com.google.storage.v2.Object and com.google.storage.v2.CryptoKeyName
   [ERROR] .../src/github.com/googleapis/java-storage/proto-google-cloud-storage-v2/src/main/java/com/google/storage/v2/CryptoKeyName.java:[178,33] incomparable types: java.lang.Class<capture#1 of ? extends com.google.storage.v2.CryptoKeyName> and java.lang.Class<capture#2 of ? extends com.google.storage.v2.Object>
   [ERROR] .../src/github.com/googleapis/java-storage/proto-google-cloud-storage-v2/src/main/java/com/google/storage/v2/CryptoKeyName.java:[179,45] incompatible types: com.google.storage.v2.Object cannot be converted to com.google.storage.v2.CryptoKeyName
   [ERROR] .../src/github.com/googleapis/java-storage/proto-google-cloud-storage-v2/src/main/java/com/google/storage/v2/BucketName.java:[135,3] method does not override or implement a method from a supertype
   [ERROR] .../src/github.com/googleapis/java-storage/proto-google-cloud-storage-v2/src/main/java/com/google/storage/v2/BucketName.java:[137,11] incomparable types: com.google.storage.v2.Object and com.google.storage.v2.BucketName
   [ERROR] .../src/github.com/googleapis/java-storage/proto-google-cloud-storage-v2/src/main/java/com/google/storage/v2/BucketName.java:[140,33] incomparable types: java.lang.Class<capture#3 of ? extends com.google.storage.v2.BucketName> and java.lang.Class<capture#4 of ? extends com.google.storage.v2.Object>
   [ERROR] .../src/github.com/googleapis/java-storage/proto-google-cloud-storage-v2/src/main/java/com/google/storage/v2/BucketName.java:[141,39] incompatible types: com.google.storage.v2.Object cannot be converted to com.google.storage.v2.BucketName
   [ERROR] .../src/github.com/googleapis/java-storage/proto-google-cloud-storage-v2/src/main/java/com/google/storage/v2/ProjectName.java:[125,3] method does not override or implement a method from a supertype
   [ERROR] .../src/github.com/googleapis/java-storage/proto-google-cloud-storage-v2/src/main/java/com/google/storage/v2/ProjectName.java:[127,11] incomparable types: com.google.storage.v2.Object and com.google.storage.v2.ProjectName
   [ERROR] .../src/github.com/googleapis/java-storage/proto-google-cloud-storage-v2/src/main/java/com/google/storage/v2/ProjectName.java:[130,33] incomparable types: java.lang.Class<capture#5 of ? extends com.google.storage.v2.ProjectName> and java.lang.Class<capture#6 of ? extends com.google.storage.v2.Object>
   [ERROR] .../src/github.com/googleapis/java-storage/proto-google-cloud-storage-v2/src/main/java/com/google/storage/v2/ProjectName.java:[131,41] incompatible types: com.google.storage.v2.Object cannot be converted to com.google.storage.v2.ProjectName
   

BucketName, CryptoKeyName and ProjectName all implemented ResourceName and follow a different code generation path than the other proto classes. This different generation path does not use fully qualified class names for java.lang classes. This particular scenario is manifesting because GCS generate a class com.google.storage.v1.Object which takes resolution precedence to java.lang.Object and prevents java.lang.Object#equals(java.lang.Object) from being implemented.

As a temporary work around I'm manually applying a search and replace which can be seen here: https://github.com/googleapis/java-storage/blob/d6acdab54582852b3c14e152a12ea2f923ff85ef/synth.py#L40-L58

[miraleung]

Using fully-qualified names for java.lang classes may make things less user-friendly or less readable, but we can fix the name collision for Object. Will look into this next week for FixIt.

[BenWhitehead]

It appears protobuf and gRPC exclusively uses fully qualified names (example https://github.com/googleapis/java-storage/pull/922/files#diff-2bb347d8e4f8109169ef2cd49aea4352494276e2264ceca7ecc9a5312c134847R308-R309). At my codes use site either short or fully qualified work equally well.