Add notes to budget https://github.com/firefly-iii/firefly-iii/issues/5373

app/Models/Budget.php

@@ -150,6 +150,15 @@ class Budget extends Model
         return $this->hasMany(BudgetLimit::class);
     }
 
+    /**
+     * @codeCoverageIgnore
+     * Get all of the notes.
+     */
+    public function notes(): MorphMany
+    {
+        return $this->morphMany(Note::class, 'noteable');
+    }
+
     /**
      * @codeCoverageIgnore
      * @return BelongsToMany