add spark:kms scope

[ObjectIsAdvantag]

KMS Scope https://developer.webex.com/docs/integrations#what-are-integrations

After registering an integration, it will include the scopes you selected along with an additional scope: spark:kms. This scope is required to give your integration permission to interact with encrypted content (such as messages). For convenience, the scope is included in the integrations's scope list in the example OAuth Authorization URL on the integration's application detail page. If you don't use the example URL, be sure to include the scope when creating authorization URLs for your integration.