- Updated Codec class to use abstract methods for encoding and decoding envelopes.
- Changed Envelope class to use Dict and Optional for payload and error fields.
- Refined error handling in RPCError class with Optional type hints for details.
- Enhanced manifest validation logic with type hints for better type safety.
- Improved plugin loading mechanism with consistent type annotations.
- Updated RPCClient to utilize Optional for codec and connection attributes.
- Refactored transport classes to use Optional for server attributes and socket paths.
- Introduced `ComponentRegistry` for managing plugin components with support for registration, enabling/disabling, and querying by type and plugin.
- Added `EventDispatcher` to handle event distribution to registered event handlers, supporting both blocking and non-blocking execution.
- Implemented `WorkflowExecutor` to manage a linear workflow execution across multiple stages, including command routing and error handling.
- Created `ManifestValidator` for validating plugin manifests against required fields and version compatibility.
- Updated `RPCClient` to use `MsgPackCodec` for message encoding.
- Enhanced `PluginRunner` to support lifecycle hooks for plugins, including `on_load` and `on_unload`.
- Added sys.path isolation to restrict plugin access to only necessary directories.
