feat(packages): Add fish shell

[EyeCantCU]

Adds package and subpackages for fish shell

Pre-review Checklist

For new package PRs only

• This PR is marked as fixing a pre-existing package request bug
  • Alternatively, the PR is marked as related to a pre-existing package request bug, such as a dependency
• REQUIRED - The package is available under an OSI-approved or FSF-approved license
• REQUIRED - The version of the package is still receiving security updates
• This PR links to the upstream project's support policy (e.g. endoflife.date)

[jonjohnsonjr]

You'll need a filter on the update: clause to avoid non-semver tags.

[EyeCantCU]

A tag filter has been implemented :)