chore: generate mfa secret in backend (#2930) [skip e2e]

* chore: get mfa secret from backend

* chore: remove unused code

packages/snjs/lib/Services/Settings/SNSettingsService.ts

@@ -42,8 +42,8 @@ export class SettingsService extends AbstractService implements SettingsClientIn
     return this.provider.updateSubscriptionSetting(name, payload, sensitive)
   }
 
-  async updateSetting(name: SettingName, payload: string, sensitive = false) {
-    return this.provider.updateSetting(name, payload, sensitive)
+  async updateSetting(name: SettingName, payload: string, sensitive = false, totpToken?: string) {
+    return this.provider.updateSetting(name, payload, sensitive, totpToken)
   }
 
   async getDoesSensitiveSettingExist(name: SettingName) {
@@ -54,6 +54,19 @@ export class SettingsService extends AbstractService implements SettingsClientIn
     return this.provider.deleteSetting(name, serverPassword)
   }
 
+  async generateMfaSecret(): Promise<string> {
+    return this.provider.getMfaSecret()
+  }
+
+  async updateMfaSetting(secret: string, totpToken: string): Promise<void> {
+    return this.provider.updateSetting(
+      SettingName.create(SettingName.NAMES.MfaSecret).getValue(),
+      secret,
+      true,
+      totpToken,
+    )
+  }
+
   getEmailBackupFrequencyOptionLabel(frequency: EmailBackupFrequency): string {
     return this.frequencyOptionsLabels[frequency]
   }