Add version parameter to npm:// assertions

[shrink]

The live-plugin-manager package accepts a version parameter.

• Parse version from assertion name using <package>:<version> format
• Replace all examples with explicit version reference to encourage safe usage
• Default to v1 not latest for safety and to address Replace pass usage in Result with passed #49?

- name: Test actor is @shrink
  uses: pr-mpt/actions-assert@v2
  with:
    assertion: npm://@assertions/is-equal@v1
    actual: "${{ github.actor }}"
    expected: shrink