Function getGADParams

getGADParams(service: UTM_SERVICES_ENUM): Record<string, any> | null
Retrieves and validates stored GAD parameters for a specific service.

This function reads a serialized UTM object from sessionStorage under the key defined by GAD_STORAGE_KEY. It ensures that:
- The stored object exists and is valid JSON.
- The GAD data has not expired (based on its expiry timestamp).
- The stored landing page corresponds to the provided service
- which basically means the gad should be related to the service which this mapping is declared in URL_TO_UTM_SERVICE_MAP or it returns null.
If any of these checks fail, the function clears the stored data and returns null.
Parameters
- service: UTM_SERVICES_ENUM
  The service identifier to validate the stored GAD data against.
Returns Record<string, any> | null
The parsed GAD parameters object if valid, or null if expired, mismatched, or invalid.
Example
```
import getGADParams from '@/functions/get-gad-params';
import { UTM_SERVICES_ENUM } from '@/constants/utm';

const gad = getGADParams(UTM_SERVICES_ENUM.INSURANCE_BODY);
if (gad) {
  console.log('Valid GAD parameters related to insurance body service:', gad);
} else {
  console.log('No valid GAD data found.');
}
```
- Defined in functions/get-gad-params/index.ts:33