Unexpected error when server expands a compressed message to learn it is too large

When the client uses “gzip” compression to compress requests, if it sends a message where the compressed size is acceptable (less than or equal to the server’s configured max) but the uncompressed size is too large, the client receives an unhelpful UNKNOWN error with a message of “Application error processing RPC”.

Interestingly, an error is logged with an exception that indicates the expected/correct error code. It’s not a warning but an error with a message that implies the exception was never caught:

```
SEVERE: Exception while executing runnable io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1MessagesAvailable@2339b6a8
io.grpc.StatusRuntimeException: RESOURCE_EXHAUSTED: Decompressed gRPC message exceeds maximum size 204800
at io.grpc.Status.asRuntimeException(Status.java:525)
at io.grpc.internal.MessageDeframer$SizeEnforcingInputStream.verifySize(MessageDeframer.java:523)
at io.grpc.internal.MessageDeframer$SizeEnforcingInputStream.read(MessageDeframer.java:478)
at com.google.protobuf.CodedInputStream$StreamDecoder.readRawBytesSlowPathRemainingChunks(CodedInputStream.java:2967)
at com.google.protobuf.CodedInputStream$StreamDecoder.readBytesSlowPath(CodedInputStream.java:3006)
at com.google.protobuf.CodedInputStream$StreamDecoder.readBytes(CodedInputStream.java:2397)
at testing.TestRequest$Builder.mergeFrom(TestRequest.java:501)
at testing.TestRequest$1.parsePartialFrom(TestRequest.java:849)
at testing.TestRequest$1.parsePartialFrom(TestRequest.java:841)
at com.google.protobuf.AbstractParser.parseFrom(AbstractParser.java:63)
at com.google.protobuf.AbstractParser.parseFrom(AbstractParser.java:25)
at io.grpc.protobuf.lite.ProtoLiteUtils$MessageMarshaller.parseFrom(ProtoLiteUtils.java:245)
at io.grpc.protobuf.lite.ProtoLiteUtils$MessageMarshaller.parse(ProtoLiteUtils.java:237)
at io.grpc.protobuf.lite.ProtoLiteUtils$MessageMarshaller.parse(ProtoLiteUtils.java:134)
at io.grpc.MethodDescriptor.parseRequest(MethodDescriptor.java:307)
at io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.messagesAvailableInternal(ServerCallImpl.java:334)
at io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.messagesAvailable(ServerCallImpl.java:319)
at io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1MessagesAvailable.runInContext(ServerImpl.java:834)
at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:133)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
at java.base/java.lang.Thread.run(Thread.java:1583)
```

io.grpc.internal.MessageDeframer と ServerCallImpl.ServerStreamListenerImpl から始め、スタックトレースを使って、解凍サイズの例外がどのように ServerImpl に到達するかを追跡します。解凍後のサイズが 204800 を超える gzip 圧縮リクエストを再現し、その後、クライアントが UNKNOWN ではなく RESOURCE_EXHAUSTED を受信し、その例外が未捕捉の SEVERE エラーとしてログに記録されなくなったことを確認します。

索引モデルが issue の本文から書いたものです。