Allow filtering by desired license(s)

[jasongitmail]

Clear and concise description of the problem

Icons collections use various licenses, some of which may not be suitable for certain projects.

Suggested solution

1. UI filter feature that show list of all unique licenses contained by one or more collections, and allow a dev to check or uncheck to show/hide.
2. Show license for a specific icon on the panel that appears after clicking an icon.

Alternative

No response

Additional context

No response

Validations

• [X] Follow our Code of Conduct
• [X] Read the Contributing Guide.
• [X] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.