(4a -> 4) Add `UnlinkedVideosTable` to `SessionsDock`

[roomrys]

Description

Very similar steps to SessionsTable (#1654) and CamerasTable (#1671) (to be filled in), except for these few items:

• [ ] Add a dictionary {linked: ..., unlinked: ...} to LabelsDataCache that remembers which videos are linked/unlinked to a RecordingSession in labels.sessions (this dictionary will be used for the items in the UnlinkedVideosTable)
• [ ] Add command class and CommandContext.link_video_to_camera method to link a Video to a RecordingSession
• [ ] Add button to "Link Video" (connecting it to the CommandContext method created above)

Types of changes

• [ ] Bugfix
• [ ] New feature
• [ ] Refactor / Code style update (no logical changes)
• [ ] Build / CI changes
• [ ] Documentation Update
• [ ] Other (explain)

Does this address any currently open issues?

[list open issues here]

Outside contributors checklist

• [ ] Review the guidelines for contributing to this repository
• [ ] Read and sign the CLA and add yourself to the authors list
• [ ] Make sure you are making a pull request against the develop branch (not main). Also you should start your branch off develop
• [ ] Add tests that prove your fix is effective or that your feature works
• [ ] Add necessary documentation (if appropriate)

Thank you for contributing to SLEAP!

:heart:

[coderabbitai[bot]]

Walkthrough

The recent updates focus on enhancing video linkage within the SLEAP application. Key improvements include adding checks and updates for unlinked videos, enabling a "link video" button, and updating models and tables for better management of video sessions. Additionally, a new command for linking videos to sessions has been introduced, along with minor adjustments and test enhancements to ensure smooth functionality.

Changes

Files	Summary
.../gui/app.py	Enhanced video linkage with checks, button enabling, and cache updates.
.../gui/widgets/docks.py	Introduced unlinked videos model, table, and link button creation.
.../gui/commands.py	Added linkVideoToSession method for video-session linkage.
.../gui/dataviews.py	Minor whitespace adjustments.
.../io/dataset.py	Added video linkage tracking and updated session-video linkage methods.
tests/gui/widgets/test_docks.py	Added tests for unlinked videos' functionality in the SessionsDock.

Poem

In the digital meadow, under the code-blue sky,
A rabbit hopped, with a gleam in its eye.
"Link videos!" it cried, with joy so profound,
For unlinked videos, a solution was found.
🐰💻🎥
With each push and pull, in the code they weave,
A tapestry of links, in SLEAP, they achieve.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 73.84%. Comparing base (79f7fba) to head (a2a4886). Report is 142 commits behind head on liezl/add-gui-elements-for-sessions.

Additional details and impacted files

@@                           Coverage Diff                           @@
##           liezl/add-gui-elements-for-sessions    #1720      +/-   ##
=======================================================================
+ Coverage                                73.37%   73.84%   +0.46%     
=======================================================================
  Files                                      134      135       +1     
  Lines                                    23973    24689     +716     
=======================================================================
+ Hits                                     17591    18231     +640     
- Misses                                    6382     6458      +76     

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