[Hard] Draft RFC for Cross-Provider Discovery Delegation

[keepsloading]

Draft the spec for allowing a domain to delegate identity hosting to another provider URL via DNS TXT records.

[keepsloading]

Friendly reminder for SSoC26 contributors: When you submit a Pull Request for this issue, please remember to also raise a dummy PR in the Memact/Context repository that references your original PR. This is required for your contribution to be considered for points on the SSoC leaderboard!

[ali0786mehdi]

@keepsloading please assign me this issue