Implement triggerField helper across all trigger modules

- Standardize virtual field creation using triggerField helper
- Simplify field definitions by removing repetitive virtual field boilerplate
- Use consistent naming pattern: '__trigger_' + fieldName instead of '__builtin_'
- Preserve existing field conditions while adding parameter storage logic
- Update all trigger field modules to use Field type consistently

src/triggers/types.ts

@@ -0,0 +1,6 @@
+import type {Field} from "payload"
+
+export type Trigger = {
+  slug: string
+  fields: Field[]
+}