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.

Inizia in slack_sdk.models e individua le definizioni dei componenti UI per Options e initial_options. Leggi il comportamento dei modelli circostanti per determinare come sono rappresentati i valori delle opzioni, quindi aggiungi una convalida della corrispondenza esatta e verifica che le discrepanze vengano segnalate agli utenti dell’SDK.