Implement tracker module

[gitttt-1234]

Tracker module: #53

This PR implements a basic tracker with the following features:

• Candidate generation: Both FixedWindow and LocalQueue methods are supported.
• Candidate updating using Flow shift
• Feature representation: Poses, Bounding boxes, Centroids
• Scoring method: OKS, IoU, Euclidean distance
• Scoring reduction : Mean, Maximum
• Track assignment: Greedy, Hungarian

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[codecov]

Codecov Report

Attention: Patch coverage is 96.72978% with 19 lines in your changes missing coverage. Please review.

Project coverage is 97.77%. Comparing base (d8f49a8) to head (58a9715).
Report is 1 commits behind head on divya/fix-topdown-aug.

Files with missing lines	Patch %	Lines
sleap_nn/tracking/tracker.py	96.47%	6 Missing ⚠️
sleap_nn/tracking/utils.py	92.30%	4 Missing ⚠️
sleap_nn/tracking/candidates/local_queues.py	95.31%	3 Missing ⚠️
sleap_nn/data/edge_maps.py	90.90%	2 Missing ⚠️
sleap_nn/training/model_trainer.py	93.54%	2 Missing ⚠️
sleap_nn/inference/predictors.py	95.00%	1 Missing ⚠️
sleap_nn/tracking/candidates/fixed_window.py	98.07%	1 Missing ⚠️

Additional details and impacted files

@@                    Coverage Diff                    @@
##           divya/fix-topdown-aug      #70      +/-   ##
=========================================================
- Coverage                  97.96%   97.77%   -0.19%     
=========================================================
  Files                         30       35       +5     
  Lines                       2798     3330     +532     
=========================================================
+ Hits                        2741     3256     +515     
- Misses                        57       74      +17     

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