Feature/Todoist: Removing premium features for non-premium users

[RobErskine]

Description

This is for my comment on #16564. I don't have Todoist premium, so I don't have access to the new Deadline feature. When trying to create a task with a Deadline, I get an error and need to remove the Deadline before continuing. This PR introduces a change that will only show the Deadline field for Premium users when using the Create Task command.

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 in the README are located outside the metadata folder if they were not generated with our metadata tool

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