Update client credentials oauth client provider

[mpgxvii]

• Add support for additional parameters for client credentials ktor oauth lib
• This would allow setting of additional params such as scope and audience when using this library
• Currently needed so that this library can be used in the Ory hydra implementation

[yatharthranjan]

Why not add those required variables explicitly instead of using a generic map?

[mpgxvii]

Why not add those required variables explicitly instead of using a generic map?

@yatharthranjan Ah okay yes I can add these explicitly. I just thought maybe we would have use cases in the future where we would need it to be more generic. But I think it's better for the params to be set explicitly. 👍

[yatharthranjan]

LGTM, thanks