Support for customizing the body in OIDC request and response filters #49041
Description
Description
Users are keeping asking how various OIDC extensions can customize either request or response request bodies to support non-standard OIDC or OAuth2 provider request or response formats.
For example, #48999, #40258, and there were Zulip queries too.
Implementation ideas
Changing the OidcRequestFilter and OidcResponseFilter signatures is not really an option, but both types of filters have access to the modifiable OidcRequestContextProperties that the filters can use to pass a customized body