Derive Clone for http requests structs

So they don't prevent a Service from implementing Clone.

crates/oauth2-types/src/pkce.rs

@@ -105,13 +105,13 @@ impl CodeChallengeMethodExt for PkceCodeChallengeMethod {
     }
 }
 
-#[derive(Serialize, Deserialize)]
+#[derive(Clone, Serialize, Deserialize)]
 pub struct AuthorizationRequest {
     pub code_challenge_method: PkceCodeChallengeMethod,
     pub code_challenge: String,
 }
 
-#[derive(Serialize, Deserialize)]
+#[derive(Clone, Serialize, Deserialize)]
 pub struct TokenRequest {
     pub code_challenge_verifier: String,
 }

crates/oauth2-types/src/requests.rs

@@ -612,7 +612,7 @@ pub struct IntrospectionResponse {
 /// [Pushed Authorization Request Endpoint]: https://datatracker.ietf.org/doc/html/rfc9126
 #[serde_as]
 #[skip_serializing_none]
-#[derive(Serialize, Deserialize, Debug, PartialEq, Eq)]
+#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq)]
 pub struct PushedAuthorizationResponse {
     /// The `request_uri` to use for the request to the authorization endpoint.
     pub request_uri: String,