Unclear description and support value for "keywords" field when doing "packages import"

[chinyeungli]

When doing a "packages import", I got errors at some rows for the "keywords" field.
such as

admin
Select a valid choice. admin is not one of the available choices.

shells
Select a valid choice. shells is not one of the available choices.

However, the "keywords" field doesn't have any description or supported values documented when I expand the "Show/hide Supported Columns" at https://enterprise.dejacode.com/admin/component_catalog/package/import/#

It is unclear what are the supported value and the purpose of this field.

[tdruez]

@chinyeungli The keywords field was refactored to accept any values in #48 and #54
Also, I've added help text in the import view.
Thanks for reporting!