Add support for RADIO models (#46425)
* Add RADIO vision encoder
* Fix RADIO integration: post_init ordering, auto registration, HF attrs
- Move post_init() to end of __init__ so weight init applies to submodules
- Register RADIO in AutoConfig/AutoModel mappings
- Add main_input_name, _no_split_modules, supports_gradient_checkpointing
- Fix unreachable summary_idxs gather branch in _extract_final
* Remove uncessary files
* Keep only cradio path
* Rewrite radio for using native transformers module
* Rename submodule from RADIO->Radio, keep RADIOModel and RADIOConfig for checkpoint compatible
* Fix for consistency check
* Add config to auto_docstring
* Add radio tests
* Fix for checkers
* Modify Radio model
* Modify init weight
* Update radio.md date
