Add iou matcher option to use linear assignment to get one-to-one matching

[msschwartz21]

Proposed Change

This PR adds an option to the IOUMatcher to force the mapping to be one-to-one using linear sum assignment. Enabling this option makes the IOUMatcher compatible with division metrics.

Types of Changes

What types of changes does your code introduce? Put an x in the boxes that apply.

• Bugfix (non-breaking change which fixes an issue)
• New feature or enhancement
• Documentation update
• Tests and benchmarks
• Maintenance (e.g. dependencies, CI, releases, etc.)

Which topics does your change affect? Put an x in the boxes that apply.

• Loaders
• Matchers
• Track Errors
• Metrics
• Core functionality (e.g. TrackingGraph, run_metrics, cli, etc.)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• I have read the developer/contributing docs.
• I have added tests that prove that my feature works in various situations or tests the bugfix (if appropriate).
• I have checked that I maintained or improved code coverage.
• I have checked the benchmarking action to verify that my changes did not adversely affect performance.
• I have written docstrings and checked that they render correctly in the Read The Docs build (created after the PR is opened).
• I have updated the general documentation including Metric descriptions and example notebooks if necessary.