- Introduced a new `ExtensionJobRegistry` to manage custom job types for extensions at runtime.
- Added `host_register_job` function to facilitate job registration from WASM extensions.
- Updated `PluginEnv` and `PluginManager` to include job registry functionality.
- Enhanced the `job` macro to support automatic job registration during plugin initialization.
- Updated documentation and tests to reflect the new job registration capabilities.
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