Add Labels.extract, Labels.trim and Video.save

[talmo]

• LabeledFrame.frame_idx: Now always converted to int type.
• Video.close(): Now caches backend metadata to Video.backend_metadata to persist metadata on close.
• copy.deepcopy() now works on Video objects even if backend is open.
• Video.save(save_path: str | Path, frame_inds: list[int] | np.ndarray | None = None, video_kwargs: dict[str, Any] | None = None): Method to save a video file to an MP4 using VideoWriter with an optional subset of frames.
• Labels.extract(inds: list[int] | list[tuple[Video, int]] | np.ndarray, copy: bool = True): Add method to extract a subset of frames from the labels, optionally making a copy, and return a new Labels object.
• Labels.trim(save_path: str | Path, frame_inds: list[int] | np.ndarray, video: Video | int | None = None, video_kwargs: dict[str, Any] | None = None): Add method to extract a subset of the labels, write a video clip with the extracted friends, and adjust frame indices to match the clip.

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[codecov]

Codecov Report

Attention: Patch coverage is 98.59155% with 1 line in your changes missing coverage. Please review.

Project coverage is 96.21%. Comparing base (4e72a11) to head (c16ca69).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
sleap_io/model/video.py	96.42%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #140      +/-   ##
==========================================
+ Coverage   96.15%   96.21%   +0.05%     
==========================================
  Files          17       17              
  Lines        2265     2327      +62     
==========================================
+ Hits         2178     2239      +61     
- Misses         87       88       +1     

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