Permission

[drewroberts]

Let's add a permissions migration to this package with a single permission:

• 'view booking calendar'

Let's assign it to the following roles:

• Owner
• Executive
• Staff

There should be a restriction to view the Nova Tool based on that permission.

We also need a few Tests (#2) for the permission that check if the Nova Tool can be viewed with and without it.

[drewroberts]

CC: @tipoff/omnia