Add support for loading "trackless" SLEAP files

[lochhh]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?
This PR enables SLEAP files (.h5 and .slp) without Tracks to be loaded.

What does this PR do?

References

This PR resolves #89

How has this PR been tested?

Relevant tests have been added and run

Checklist:

• The code has been tested locally
• Tests have been added to cover all new functionality
• The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7e12f08) 98.34% compared to head (37670ad) 98.37%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #90      +/-   ##
==========================================
+ Coverage   98.34%   98.37%   +0.03%     
==========================================
  Files           8        8              
  Lines         362      369       +7     
==========================================
+ Hits          356      363       +7     
  Misses          6        6              

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[niksirbi]

LGTM! I also tested in on the sample data for the course, and it works!