Modify inference and centroid model to allow Bonsai ingestion

[sheridana]

Description

• Add function to InferenceModel that allows saving to a frozen graph, for ingestion into a bonsai pipeline
• Add standalone centroid model

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:

[codecov[bot]]

Codecov Report

Merging #850 (a7a03ca) into develop (c4409dd) will increase coverage by 0.18%. The diff coverage is 90.58%.

@@             Coverage Diff             @@
##           develop     #850      +/-   ##
===========================================
+ Coverage    67.40%   67.59%   +0.18%     
===========================================
  Files          130      130              
  Lines        22110    22187      +77     
===========================================
+ Hits         14903    14997      +94     
+ Misses        7207     7190      -17     

Impacted Files	Coverage Δ
sleap/nn/inference.py	79.54% <89.87%> (+4.35%)	:arrow_up:
sleap/__init__.py	100.00% <100.00%> (ø)
sleap/nn/data/resizing.py	65.33% <100.00%> (-0.44%)	:arrow_down:
sleap/nn/peak_finding.py	75.51% <100.00%> (-17.50%)	:arrow_down:
sleap/nn/config/training_job.py	93.87% <0.00%> (+10.20%)	:arrow_up:

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