Add `Options` / `initial_options` validation

Suggestion raised in: https://github.com/slackapi/python-slack-sdk/issues/1509

Behavior:
initial_options options must contain an exact match of options provided, or users experience issues with properly updating forms. Suggestion has been raised to update this SDK to notify developers when an option provided does not exactly match an initial_options selection.

Category (place an x in each of the [ ])

• slack_sdk.web.WebClient (sync/async) (Web API client)
• slack_sdk.webhook.WebhookClient (sync/async) (Incoming Webhook, response_url sender)
• slack_sdk.models (UI component builders)
• slack_sdk.oauth (OAuth Flow Utilities)
• slack_sdk.socket_mode (Socket Mode client)
• slack_sdk.audit_logs (Audit Logs API client)
• slack_sdk.scim (SCIM API client)
• slack_sdk.rtm (RTM client)
• slack_sdk.signature (Request Signature Verifier)

Requirements

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you are agreeing to those rules.

Comienza en slack_sdk.models y localiza las definiciones de los componentes de UI para Options e initial_options. Lee el comportamiento de los modelos circundantes para determinar cómo se representan los valores de las opciones; después, añade una validación de coincidencia exacta y verifica que las discrepancias se notifiquen a los usuarios del SDK.