[Feature] Find the license

[atandrewlee]

For Go, we want to be able to auto-fill the license.

Questions To Consider

• We can get the license from the GET call in the resolve_vanity_import function
• We don't want to have to make multiple calls (1 for the repo url & 1 for the license`

Proposed Solution

• resolve_vanity_import -> get_repo_and_license
  • All we have to add is another selector to find the element related to License
  • Return a tuple of 2 strings
• (+) add check for the License (to see if it is redistributable)
• (+) check license "format" to meet sourcecraft requirements
  • must be "propietary" or SPDX Format
  • https://documentation.ubuntu.com/rockcraft/en/latest/reference/rockcraft.yaml/#license