* refactor(echo_plugin): Remove executor configuration and simplify echo logic
- Removed executor field from echo_plugin configuration
- Simplified echo message handling process by processing directly in main thread
- Updated example configurations and descriptions in documentation
* refactor(echo_plugin): Refactor EchoPlugin class
- Remove get_type_support_func_ member variable, replace with direct GetTypeSupport method call in RegisterEchoChannel
- Merge EchoFunc creation and subscription callback logic to reduce intermediate variables
* refactor(echo_plugin): Remove GetTypeSupport function, directly access type_support_map where needed
* refactor(echo_plugin): Remove unused headers and member functions
* refactor(echo_plugin): Remove unnecessary 'this' capture in lambda expression
* refactor(echo_plugin): optimize buffer handling logic in EchoPlugin
* format
* fix(echo_plugin): add release_callback func before return in sub_wrapper.callback
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Co-authored-by: yuguanlin <yuguanlin@agibot.com>
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