[Openid-specs-ab] Issue #1019: Core: IANA Consideration (openid/connect)

[Nat Sakimura]

New issue 1019: Core: IANA Consideration
https://bitbucket.org/openid/connect/issues/1019/core-iana-consideration

Nat Sakimura:

Authorization request parameter registration is needed. 

https://mailarchive.ietf.org/arch/msg/oauth/_E14Trqu962cReu3t6FquPEyigY

We should register the top level JWT claims such as  `iss`, `aud`, `sub`, and
`exp` (and maybe other common JWT claims that are about the token itself
like `jti`, `iat`, etc) as authorization request parameters in
https://www.iana.org/assignments/oauth-parameters/oauth-parameters.xhtml#parameters
because the parameter names and claim names collide when using a request object. 

Potentially, we may need to register everything in 
https://www.iana.org/assignments/jwt/jwt.xhtml