Add custom fields to JenisLegalitasJaminan

Added `custom_field` and `custom_field_type` columns to the `jenis_legalitas_jaminan` table. Updated model, migration, and request files to handle these new fields, ensuring they are optional and have a maximum length of 255 characters.

app/Models/JenisLegalitasJaminan.php

@@ -7,5 +7,5 @@
     class JenisLegalitasJaminan extends Base
     {
         protected $table    = 'jenis_legalitas_jaminan';
-        protected $fillable = ['code', 'name','slug'];
+        protected $fillable = ['code', 'name','slug','custom_field','custom_field_type'];
     }