feat(core): add a limit to no. of outgoing pending friend requests

crates/core/result/src/lib.rs

@@ -60,6 +60,9 @@ pub enum ErrorType {
     Blocked,
     BlockedByOther,
     NotFriends,
+    TooManyPendingFriendRequests {
+        max: usize,
+    },
 
     // ? Channel related errors
     UnknownChannel,

crates/core/result/src/rocket.rs

@@ -25,6 +25,7 @@ impl<'r> Responder<'r, 'static> for Error {
             ErrorType::Blocked => Status::Conflict,
             ErrorType::BlockedByOther => Status::Forbidden,
             ErrorType::NotFriends => Status::Forbidden,
+            ErrorType::TooManyPendingFriendRequests { .. } => Status::BadRequest,
 
             ErrorType::UnknownChannel => Status::NotFound,
             ErrorType::UnknownMessage => Status::NotFound,