Remove Protobuf dependency for C++

Fix integer conversion warnings in src/core/support

Fixing Windows port after the removal of the backup poller.

Add const to ByteBuffer methods and add tests

Fixing recursive locking under Windows.

Add metadata batch documentation

Fixed warning while parsing compression enum bytes.

Shutting down is synchronous under Windows, so we don't want to do that while holding a lock.

With the backup poller gone, the caller of grpc_pollset_work is expecting it to sleep. Aligning the behavior of the Windows port with the behavior of the Posix port.

Fix flaky test

Generated files info message

Fixed integer conversion warnings in src/core/json

Dont do nothing for eternity

Add pollset_set.h to build.json

Update grpc.h comments for grpc_call thread safety

Use a character literal instead of grpc::string

Assertation could be false if the server responds quickly enough (it's
unlikely to). Removing the assert does not change the nature of the
test.

Fixing ssl auth context.

Always use the first status code received

Ensure op flags don't have garbage from malloc

Removed const-ness from Reporter interface methods