Grants string

[morganelle]

Description

Remove auth0.String call around grants inputs, which was creating a string pointer output in the console when apps create was run with the --grants flag. apps show was not affected, nor was allowing the CLI to set default grants.

Testing

Tested manually and verified that behavior in the UI remained unchanged.

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not master

[Widcket]

Thanks!