[Feature Request] Add a model for the classic API category record

[Honestpuck]

In a similar fashion to other models such as classic.computer_groups there is a need for a model for classic.categories

Proposal

>>> categories = client.classic_api.list_all_categories()
>>> len(categories)
4
>>> type(categories[0])
<class 'jamf_pro_sdk.models.classic.categories.CategoriesItem'>
>>> for c in categories:
...   print(c.name)
...
Enrolment
Applications
Security
Tools

Additional Details

I actually wanted to add a model for policies but thought I would start with a simpler model, so categories.

(This project is a stretch for my python skills. We will see how I go.)

[Honestpuck]

Please assign it to me if it's acceptable :)

[brysontyrrell]

@Honestpuck If you want to take a stab at it do a fork and open a PR!

[Honestpuck]

Done :)