public static GroupJoinRequest.Builder getGroupJoinRequestBuilder() {
        return GROUP_JOIN_REQUEST.get()
                .clear();
    }
Using cached builders is a tradeoff between code maintainability and efficiency. For better
efficiency, we can write our own code generator to make protobuf models mutable, but it is
troublesome, so we just cache these builders for better efficiency while don't need to modify the
generated codes.

@author James Chen
turms-server-common/src/main/java/im/turms/server/common/access/client/dto/ClientMessagePool.java