Document FAPI compliance

[maartenba]

Add docs on FAPI compliance. Ideally in a separate page (with a v7.3 badge in the sidebar).

Please target release/is7.3 in the pull request.

IdentityServer is 7.3.0 is officially certified as conformant with the FAPI 2.0 Security Profile.

• JWT Validation Clock Skew Option by @bhazen in #1813
• Include PAR in mtls aliases by @josephdecock in #1955
• Support binding of authorization codes to dpop proof key via dpop header by @josephdecock in #1974
• Respect port number in mTLS configuration by @josephdecock in #1990
• Adjust Multiple DPoP Token Error by @bhazen in #2004
• Options of Allowed Signing Algorithms JWTs and DPoP Proof Tokens by @bhazen in #2006
• Adjust Default Values for Clock Skew Config Options by @bhazen in #2010
• Change error when required DPoP proof is missing by @bhazen in #2011
• Reworked supported algorithm options by @josephdecock in #2026

[khalidabuhakmeh]

@maartenba you want this as a top-level page or is there a section this goes under?

[maartenba]

Good question. Perhaps a separate top-level page under Tokens? https://docs.duendesoftware.com/identityserver/tokens/ (other places possibly as well but this seems to make sense)