feat: Add slowmode functionality to text channels (#680)

* feat: Add slowmode functionality to text channels

Signed-off-by: arsabutispik <ispik@ispik.dev>

* fix: use atomic check-and-set to prevent spamming with scripts

Signed-off-by: arsabutispik <ispik@ispik.dev>

* feat: Add BypassSlowmode permission to channel permissions

Signed-off-by: arsabutispik <ispik@ispik.dev>

* refactor: Use set_options instead of manually building the command

Signed-off-by: arsabutispik <ispik@ispik.dev>

---------

Signed-off-by: arsabutispik <ispik@ispik.dev>

crates/core/result/src/axum.rs

@@ -36,6 +36,9 @@ impl IntoResponse for Error {
             ErrorType::NotInGroup => StatusCode::NOT_FOUND,
             ErrorType::AlreadyPinned => StatusCode::BAD_REQUEST,
             ErrorType::NotPinned => StatusCode::BAD_REQUEST,
+            ErrorType::InSlowmode {
+                retry_after: _,
+            } => StatusCode::TOO_MANY_REQUESTS,
 
             ErrorType::CantCreateServers => StatusCode::FORBIDDEN,
             ErrorType::UnknownServer => StatusCode::NOT_FOUND,