Function createAndStoreGrant

createAndStoreGrant(
params: GrantPermissionParams,
relayerUrl: string,
): Promise<{ grantFile: GrantFile; grantUrl: string }>
Creates a grant file and stores it in IPFS.
Parameters
- params: GrantPermissionParams
  The permission parameters to create the grant from. Obtain from user input or application configuration.
- relayerUrl: string
  The URL of the relayer service for IPFS storage. Obtain from SDK configuration or environment.
Returns Promise<{ grantFile: GrantFile; grantUrl: string }>
Promise resolving to an object containing the grant file and its IPFS URL
Remarks
Combines grant creation, validation, and IPFS storage in a single operation. The grant is stored immutably on IPFS and can be referenced by its URL in on-chain permission records.

Throws
When grant parameters are invalid. Check error message for specific validation failures.

Throws
When IPFS storage fails. Retry with exponential backoff or check relayer status.
Example
```
const { grantFile, grantUrl } = await createAndStoreGrant(
  {
    grantee: applicationAddress,
    operation: 'data_processing',
    parameters: { dataTypes: ['medical', 'financial'] }
  },
  'https://relayer.vana.org'
);

console.log('Grant stored at:', grantUrl);
```
- Defined in packages/vana-sdk/src/utils/grants.ts:104