Haplotype graph efficiency improvements

[tcasstevens]

Description

Provide a summary of your changes including motivation and context. If these changes fix a bug or resolves a feature request, be sure to link to that issue.

Type of change

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

• [ ] CHANGE (fix or feature that would cause existing functionality to not work as expected)
• [ ] FEATURE (non-breaking change which adds functionality)
• [ ] BUGFIX (non-breaking change which fixes an issue)
• [X] ENHANCEMENT (non-breaking change which improves existing functionality)
• [ ] NONE (if none of the other choices apply. Example, tooling, build system, CI, docs, etc.)

Checklist:

• [ ] I have performed a self-review of my code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have updated relevant documentation

Changelog entry

Please add a one-line changelog entry below. This will be copied to the changelog file during the release process.

HaplotypeGraph performance improvements. fun getRanges(dbPath: String): Array<MutableList<Array<String?>>>
to
fun getRanges(dbPath: String): Map<ReferenceRange, Int>

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 95.83333% with 1 line in your changes missing coverage. Please review.

Project coverage is 80.10%. Comparing base (40abd69) to head (bd7ea87). Report is 51 commits behind head on main.

Files with missing lines	Patch %	Lines
...tlin/net/maizegenetics/phgv2/api/HaplotypeGraph.kt	95.83%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #245 +/- ## ========================================== - Coverage 80.12% 80.10% -0.03% ========================================== Files 82 82 Lines 5827 5826 -1 Branches 1023 1023 ========================================== - Hits 4669 4667 -2 Misses 782 782 - Partials 376 377 +1 ```

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