feat(purl): Add more PURL-to-ecosystem mappings

[cuixq]

Fixes #2411

This PR adds more mappings for the following PURL types to their corresponding OSV ecosystems:

• composer
• conan
• cran
• github
• hackage
• k8s
• swift

The purlEcosystems map also has been sorted alphabetically by PURL type.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.78%. Comparing base (474b051) to head (8184a30).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/utility/purl/purl_to_package.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2415      +/-   ##
==========================================
- Coverage   67.79%   67.78%   -0.02%     
==========================================
  Files         172      172              
  Lines       13286    13291       +5     
==========================================
+ Hits         9007     9009       +2     
- Misses       3572     3576       +4     
+ Partials      707      706       -1     

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[another-rex]

Use the GIT ecosystem here is probably better.

[cuixq]

we don't yet have a GIT ecosystem - I have commented this out and we can add it back once we have the ecosystem added.