Invoked Lambda during the UserInfo endpoint to populate the response

Problem

At the moment, we can only populate JWT during the token endpoint to populate the response and it really works fine but it has a cost, it increases the size of a token while some WAF providers has limitation on header size so we can not pass that heavy sized token from client app to backend webservice.

Solution

If there is a Lambda that can be invoked during the UserInfo endpoint to populate the response instead of only relying upon the contents of the JWT sent to the endpoint will be beneficial.

Additional context

• https://fusionauth.io/docs/v1/tech/oauth/endpoints#userinfo

Related issues:

• /oauth2/userinfo should not be dependent on the claims in token #1582
• Feature : Requesting claims using the claims request parameter #308
• Add locale and timezone information to the oauth userinfo endpoint #659
• Ability to remove PII from api (/oauth2/userinfo, /api/user) #1475
• /oauth2/userinfo should not be dependent on the claims in token #1582

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