Fix builders ABI backward compatibility broken in v1.33.0

[sergiitk]

What's this PR do?

Brings back io.grpc.internal.AbstractManagedChannelImplBuilder and io.grpc.internal.AbstractServerImplBuilder to the class hierarchy to fix broken ABI backward compatibility.

Any background context you want to provide?

AbstractManagedChannelImplBuilder

AbstractManagedChannelImplBuilder brought back as a copy of ForwardingChannelBuilder support pre-v1.33 binary interface, e.g. io.grpc.netty.NettyChannelBuilder.maxInboundMessageSize(I)Lio/grpc/internal/AbstractManagedChannelImplBuilder;

AbstractServerImplBuilder

• Brings back io.grpc.internal.AbstractManagedChannelImplBuilder and io.grpc.internal.AbstractServerImplBuilder to the class hierarchy to fix broken ABI backward compatibility.
• Since ForwardingServerBuilder was introduced in v1.33.0, I changed it to ForwardingServerBuilder<T extends ServerBuilder<T>>. and made it package-private.

What are the relevant tickets?

• Fixes Binary backwards-incompatibily in 1.33.0 #7552
• Partially undoes Hide AbstractManagedChannelImplBuilder from public API #7211

[ejona86]

@sergiitk, did you push your changes?

[sergiitk]

@ejona86 on it

[sergiitk]

Confirming the latest change fixes server builders ABI.

❯ java -cp "./abi-1.32.2.jar:./deps-1.32.2/*" org.example.AbiServer
ServerImpl{logId=2, transportServers=[NettyServer{logId=1, address=0.0.0.0/0.0.0.0:10000}]}

❯ java -cp "./abi-1.32.2.jar:./deps-1.33.0/*" org.example.AbiServer
Exception in thread "main" java.lang.NoSuchMethodError: 
 io.grpc.netty.NettyServerBuilder.handshakeTimeout(JLjava/util/concurrent/TimeUnit;)Lio/grpc/internal/AbstractServerImplBuilder;
	at org.example.AbiServer.<init>(AbiServer.java:15)
	at org.example.AbiServer.main(AbiServer.java:23)

❯ java -cp "./abi-1.32.2.jar:./deps-1.34-7eac3b0/*" org.example.AbiServer
ServerImpl{logId=2, transportServers=[NettyServer{logId=1, address=0.0.0.0/0.0.0.0:10000}]}

src:

package org.example;

import java.util.concurrent.TimeUnit;
import io.grpc.Server;
import io.grpc.ServerBuilder;
import io.grpc.netty.NettyServerBuilder;

public class AbiServer {
  private final NettyServerBuilder nsb;

  public AbiServer() {
    nsb = NettyServerBuilder
        .forPort(10_000)
        .initialFlowControlWindow(100)                        // own in 1.32.2
        .handshakeTimeout(Long.MAX_VALUE, TimeUnit.SECONDS);  // moved from abstract to fwd in v1.33.0
  }

  public ServerBuilder getBuilder() {
    return nsb;
  }

  public static void main(String[] args) {
    AbiServer me = new AbiServer();
    Server s = me.getBuilder().build();
    System.out.println(s);
  }
}