Grant refresh token if is configured to client

[lionick]

When a client has been configured with refresh_token as part of its grant_types_supported
then, we should grant it, even if refresh_token is not at global configuration.

CC: @c00kiemon5ter @NicolasLiampotis

[c00kiemon5ter]

This work should be done against the main branch.
We are in the process of removing the develop branch.

[lionick]

I have changed the base branch to main.

[c00kiemon5ter]

This ensures that client-specific settings are respected and override the global AS settings - in this case for the supported grant types.