This brings it in line with its documentation and akkoma-fe’s
expectations. For backwards compatibility URL parameters are still
accept with lower priority. Unfortunately this means duplicating
parameters and descriptions in the API spec.
Usually Plug already pre-merges parameters from different sources into
the plain 'params' parameter which then gets forwarded by Phoenix.
However, OpenApiSpex 3.x prevents this; 4.x is set to change this
https://github.com/open-api-spex/open_api_spex/issues/334https://github.com/open-api-spex/open_api_spex/issues/92
Fixes: #691
Fixes: #722