* Rework of Extensibility Intro, adopted examples to missing OPENVINO_FRAMEWORK_MAP
* Removed OPENVINO_FRAMEWORK_MAP reference
* Frontend extension detailed documentation
* Fixed distributed snippets
* Fixed snippet inclusion in FE extension document and chapter headers
* Fixed wrong name in a snippet reference
* Fixed test for template extension due to changed number of loaded extensions
* Update docs/Extensibility_UG/frontend_extensions.md
Co-authored-by: Ivan Tikhonov <ivan.tikhonov@intel.com>
* Minor fixes in extension snippets
* Small grammar fix
Co-authored-by: Ivan Tikhonov <ivan.tikhonov@intel.com>
Co-authored-by: Ivan Tikhonov <ivan.tikhonov@intel.com>