Expose license tag to the search endpoint and filters

[davidgamez]

Describe the problem

In this PR, the license tags will be exposed in the feeds search endpoint v1/search.

Proposed solution

• The license tag ids are returned in the search endpoint as a list; example:
  license_tags: [
  "family:ODC",
  "license:open-data-commons"
  ]
• Add license tag filter to the search endpoint

Alternatives you've considered

No response

Additional context

No response