add /openid/request_token and /openid/userinfo routes

heavily changed and improved by me

Co-authored-by: mikoto <avdb@keemail.me>
Signed-off-by: strawberry <strawberry@puppygock.gay>

src/api/server/mod.rs

@@ -7,6 +7,7 @@
 pub(super) mod key;
 pub(super) mod make_join;
 pub(super) mod make_leave;
+pub(super) mod openid;
 pub(super) mod publicrooms;
 pub(super) mod query;
 pub(super) mod send;
@@ -27,6 +28,7 @@
 pub(super) use key::*;
 pub(super) use make_join::*;
 pub(super) use make_leave::*;
+pub(super) use openid::*;
 pub(super) use publicrooms::*;
 pub(super) use query::*;
 pub(super) use send::*;