Change Role to have String over PermissionFlags

PermissionFlags implementation needs to be figured out a bit better before we can use it here.

src/types/entities/role.rs

@@ -16,7 +16,7 @@ pub struct RoleObject {
     pub unicode_emoji: Option<String>,
     pub position: u16,
     #[serde(default)]
-    pub permissions: PermissionFlags,
+    pub permissions: String,
     pub managed: bool,
     pub mentionable: bool,
     #[cfg(feature = "sqlx")]