merge the functionality of filter and search API in licenses.

- Create a single API to implement the application of filter and search in licenses:
- Filter License API - `api/licenses`
- Search in License API - `api/licenses/search`

The purpose is to create an API that can merge the results of filter and search API.

Start by tracing the existing `api/licenses` and `api/licenses/search` entry points and compare how each applies filtering, searching, and formats results. Done means the license API exposes a single way to combine filter and search results while preserving the relevant existing behavior.

Written by the indexing model from the issue text.