feat: support OIDC id_token

- generate JWT id_token in token exchange
- store optional nonce in authorization object
- switch to RS256 algorithm for JWT signature
- add JWKs endpoint to provide OIDC clients with public keys

lib/http_server/Cargo.toml

@@ -43,6 +43,15 @@ argh = { workspace = true }
 sqlx = { workspace = true }
 uuid = { workspace = true }
 url = { workspace = true }
+pem = "3.0.4"
+
+# For now, we test if it's viable, and later we will fork it to fix the build (cf. issue
+# https://github.com/informationsea/jsonwebkey-rs#1 )
+[dependencies.jsonwebkey-convert]
+path = "/home/mbess/workspace/foss/rust_libs/jsonwebkey-rs/jsonwebkey-convert"
+features = ["simple_asn1", "pem"]
+
+pem = "3.0.4"
 
 [build-dependencies]
 minijinja-embed = "2.3.1"