* feat: enhance PluginRunner to build plugins from source directories
- Added functionality to the PluginRunner to detect if the plugin package path is a directory and build the plugin accordingly.
- Introduced a new method `_build_plugin` to handle the building process and log the output.
- Implemented resource cleanup for temporary directories used during the build process.
- Updated integration tests to reflect changes in the mock server configuration by using a constant for the server port.
* fix: linter
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