Check permissions method doesn't handle pagination properly

permissions endpoint returns a paginated list. The current get_permissions method does not account for it.

https://github.com/Kinto/kinto-http.py/blob/1182c295f23194e8851a1df582a14153b736cfcc/src/kinto_http/client.py#L682

It should use pagination properly. This is handled appropriately in https://github.com/Kinto/kinto.js/blob/9e8086989a59beaa9616c6cd8aaa1d756cda66f4/src/http/base.ts#L849

Start in src/kinto_http/client.py at get_permissions around line 682, then compare its pagination handling with the kinto.js implementation linked at src/http/base.ts around line 849. The work is complete when get_permissions handles the paginated permissions endpoint and returns the full list.

Written by the indexing model from the issue text.