Option to show start date in Asana create form

[parterburn]

Description

Paid Asana accounts unlock the option for Start Date, but it's very optional inside Asana's UI and only used in more complex workflows. However, inside the Raycast extension, it has as much weight in the UI as Due Date and is often mistyped for this more important date in the flow of creating tasks quickly.

This PR adds a setting to Show start date so that it won't show in the Create Task screen of unchecked. Fix #12558.

Screencast

Checklist

• I read the extension guidelines
• I read the documentation about publishing
• I ran npm run build and tested this distribution build in Raycast
• I checked that files in the assets folder are used by the extension itself
• I checked that assets used by the README are placed outside of the metadata folder

[raycastbot]

Thank you for the update! 🎉

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