feat: add support of showIf

Author: yaroslav8765

index.ts

@@ -75,7 +75,8 @@ export default class  extends AdminForthPlugin {
         create: false,
         edit: false
       },
-      label: this.options.labelForColumn || this.options.linkedResourceId
+      label: this.options.labelForColumn || this.options.linkedResourceId,
+      showIf: this.options.showIf || null,
     };
     resourceConfig.columns.push(virtualColumn);
 

types.ts

@@ -1,5 +1,7 @@
+import { Predicate } from "adminforth"
 export interface PluginOptions {
   linkedResourceId: string
   dontDeleteJunctionRecords?: boolean 
   labelForColumn?: string
+  showIf?: Predicate
 }