Add janet package manager (jpm) 1.1.0

[tdejager]

Checklist

• Title of this PR is meaningful: e.g. "Adding my_nifty_package", not "updated meta.yaml".
• License file is packaged (see here for an example).
• Source is from official source.
• Package does not vendor other packages. (If a package uses the source of another package, they should be separate packages or the licenses of all packages need to be packaged).
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This adds the jpm package manager for the janet language, which is also on conda-forge. The recipe contains a number of tests to test that the package manager works as expected.

[github-actions]

Hi! This is the staged-recipes linter and your PR looks excellent! 🚀

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipes/jpm/recipe.yaml) and found it was in an excellent condition.