Create a custom field

Creates a new custom field in a workspace. Every custom field is required
to be created in a specific workspace, and this workspace cannot be
changed once set.

A custom field’s name must be unique within a workspace and not conflict
with names of existing task properties such as Due Date or Assignee.
A custom field’s type must be one of text, enum, multi_enum, number,
date, or people.

Returns the full record of the newly created custom field.

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