feat: Add support for totpSecret (#1051)

## Description

## Documentation

Does this require changes to the WorkOS Docs? E.g. the [API
Reference](https://workos.com/docs/reference) or code snippets need
updates.

```
[ ] Yes
```

If yes, link a related docs PR and add a docs maintainer as a reviewer.
Their approval is required.

Author: faroceann

src/user-management/interfaces/enroll-auth-factor.interface.ts

@@ -3,10 +3,12 @@ export interface EnrollAuthFactorOptions {
   type: 'totp';
   totpIssuer?: string;
   totpUser?: string;
+  totpSecret?: string;
 }
 
 export interface SerializedEnrollUserInMfaFactorOptions {
   type: 'totp';
   totp_issuer?: string;
   totp_user?: string;
+  totp_secret?: string;
 }

src/user-management/serializers/enroll-auth-factor-options.serializer.ts

@@ -9,4 +9,5 @@ export const serializeEnrollAuthFactorOptions = (
   type: options.type,
   totp_issuer: options.totpIssuer,
   totp_user: options.totpUser,
+  totp_secret: options.totpSecret,
 });

src/user-management/user-management.spec.ts

@@ -603,6 +603,7 @@ describe('UserManagement', () => {
         type: 'totp',
         totpIssuer: 'WorkOS',
         totpUser: 'some_user',
+        totpSecret: 'secret-test',
       });
 
       expect(fetchURL()).toContain(