[RL] add pause, update_weights, resume interface for async RL (#6052)

* support dynamic run_control_request through zmq from apiserver to common_engine

* support pause/resume/is_paused/update_weights in apiserver->common_engine by common run_control_method

* change /is_puased from HTTP POST method to GET method

* add pause、resume、is_paused implementation

* support engine <==> worker communication(request&response)

* support sync weights through RDMA from checkpoint_transfer

* support specified version, rsync_config in update_weights rpc call

* add pause, update_weights, resume interface for async RL

* bug fix: update_weights support using default arguments

* fix typo

* typo fix

* typo fix

* typo fix

* add unitest for control request/response, localscheduler.get_inflight_requests, resource_manager_v1.preempted_all

* add "rsync" to LoadConfig.load_strategy Literal type hints

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* typo fix

* typo fix

* Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* check version/rsync params

* add error log when version.txt not exists

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* raise specified ValueError when paramters check failed

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* tp barrier after run_control_method

* encode 'engine_worker_queue_port' to unique name of worker2engine fmq queue

* typo fix

* typo fix

---------

Co-authored-by: Jiang-Jia-Jun <163579578+Jiang-Jia-Jun@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

fastdeploy/engine/engine.py

@@ -556,6 +556,7 @@ class LLMEngine:
             f" --graph_optimization_config '{self.cfg.graph_opt_config.to_json_string()}'"
             f" --guided_decoding_backend {self.cfg.structured_outputs_config.guided_decoding_backend}"
             f" --load_strategy {self.cfg.load_config.load_strategy}"
+            f" --rsync_config '{json.dumps(self.cfg.load_config.rsync_config)}'"
             f" --early_stop_config '{self.cfg.early_stop_config.to_json_string()}'"
             f" --reasoning_parser {self.cfg.structured_outputs_config.reasoning_parser}"
             f" --load_choices {self.cfg.load_config.load_choices}"