update `list_videos_in_folder` (#3303)

* Update `list_video_files_in_folder` only filter explicitly provided files if filter `video_type` is set.

- Accept files without extension
- Default folder searching is kept as is (using valid video extensions)

* add test for list_videos_in_folder

* Add deprecation utils: decorator for deprecated functions

* move `list_videos_in_folder` to `collect_video_paths` in auxfun_videos.py

* export `deeplabcut.collect_video_paths(..)` from auxfun_videos.py

* update `collect_video_paths`: add exclude patterns

* deprecate auxfun `get_list_of_videos`  in favor of `collect_video_paths`

* add pytest deprecation marker `test_get_list_of_videos`

* Mark `get_video_list` as deprecated (keep for now for backward compatibility)

* fix test_collect_video_paths: rename keyword -> extensions

* Adjust  `extensions` parameter: flexibly coerce str / list / tuple -> set of extensions.

* `collect_video_paths`: sort videos if shuffle=False

* update docstring non-recursive directory scanning.

* update collect_video_paths: DEFAULT_EXCLUDE_PATTERNS

* update _coerce_extensions: only "" and None normalize to None

* fix instance check in _coerce_video_extensions

* fix pytest: assert alphabetic ordering if shuffle=False

* fix empty string case in _coerce_extensions

* Add structured deprecation info and warnings (#3326)

* Add structured deprecation info and warnings

Introduce a DLCDeprecationWarning and a DeprecationInfo pydantic model to standardize deprecation metadata (kind, target, replacement, since, removed_in, renamed params) with parsing and validation of versions. Revamp deprecated and renamed_parameter decorators to build messages from DeprecationInfo, emit DLCDeprecationWarning, attach metadata to wrapped callables (__deprecated_info__, __deprecated_params__), use ParamSpec/TypeVar typing for wrappers, and enforce error when both old and new kwargs are passed. Switch to packaging.version for version parsing.

* Use DLCDeprecationWarning and add metadata tests

Replace generic DeprecationWarning checks with DLCDeprecationWarning and import packaging.version.Version. Add tests verifying deprecated decorators attach metadata (including since/removed_in parsed as Version), validate invalid version inputs, and ensure removed_in > since. Also add tests for renamed_parameter behavior (conflicting old+new raises, metadata attachment, and invalid since handling) and small docstring/name preservation assertions.

* Add packaging as core dep

* guarantee unchanged behavior for deprecated `get_list_of_videos` and `list_videos_in_folder`

* add warning if still unsupported extensions encountered

* Consequently adjust `videotype` signatures of collect_video_path callers

* refactor collect_video_paths: add warnings, raise for empty sequence.

* update tests for collect_video_paths

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Co-authored-by: Cyril Achard <cyril.achard@epfl.ch>
Co-authored-by: Mackenzie Mathis <mathis@rowland.harvard.edu>