(3d -> 3c) Add method for multi instance products

[roomrys]

Description

This method adapts the instance grouping to consider mutliple instances per frame instead of just a single instance per frame.

Types of changes

• [ ] Bugfix
• [x] 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:

Summary by CodeRabbit

• New Features

  • Enhanced triangulation capabilities with multi-instance support.
  • Improved accuracy of instance updates using reprojected coordinates.

• Refactor

  • Streamlined methods within the TriangulateSession for better performance and maintainability.
  • Updated test cases to align with the new method parameters and logic.

• Bug Fixes

  • Corrected the instance verification process to ensure sufficient data for accurate triangulation.

[coderabbitai[bot]]

Walkthrough

The updates to the codebase revolve around enhancing the triangulation process in a GUI application. The TriangulateSession class has been improved with new methods for instance grouping and coordinate reprojection. The do_action and update_instances methods have been modified to use these enhancements. Refactoring has made the verification of views and instances more robust, and the handling of multi-instance products has been refined. Overall, the changes aim to improve the accuracy and efficiency of the triangulation workflow.

Changes

Files	Summary
.../gui/commands.py	Introduced permutations from itertools, refactored do_action, verify_views_and_instances, and update_instances methods; added get_instance_grouping_and_reprojected_coords and _get_instance_grouping methods to TriangulateSession.
.../gui/test_commands.py	Updated TriangulateSession method calls and parameters; replaced get_instance_grouping with _get_instance_grouping and adjusted its logic; changed parameters for get_and_verify_enough_instances, update_instances, get_products_of_instances, and calculate_error_per_frame methods.

Poem

🐇 In the realm of code, where triangles align,
A rabbit hopped through, refactoring fine.
With each leap and bound, errors took flight,
🌟 Magic in numbers—triangulation's delight! 🌟

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[codecov[bot]]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (1b21838) 73.85% compared to head (a3aca14) 73.81%.

Files	Patch %	Lines
sleap/gui/commands.py	84.61%	8 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## liezl/add-method-to-test-instance-grouping #1605 +/- ## ============================================================================== - Coverage 73.85% 73.81% -0.05% ============================================================================== Files 135 135 Lines 24617 24636 +19 ============================================================================== + Hits 18181 18185 +4 - Misses 6436 6451 +15 ```

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