fix: use AuthURLParam to set client id and secret #216
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workaround to deal with golang/oauth2#320
tldr is that IDP servers tend to not be fully compliant with how client
credentials are passed and have bespoke arrangements so anything goes
this enforces the standard implementation from the RFC and has it working
for any RFC compliant OIDC server
full info here golang/oauth2#320
supersedes #204