Feat/add gateway categories

[brennoo]

This pull request adds support for the ListGatewayCategories endpoint.

Description

Our main driver is that we are looking into have this data available as a data resource in the terraform provider, please let me know if this is the right direction.

Has your change been tested?

besides the test case I created this script and the output seems correct

Types of changes

What sort of change does your code introduce/modify?

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.
• [x] This change is using publicly documented in cloudflare/api-schemas and relies on stable APIs.

[github-actions[bot]]

changelog detected :white_check_mark:

[jacobbednarz]

this functionality already exists in v2 - is there a reason why we cannot use that instead?

[brennoo]

this functionality already exists in v2 - is there a reason why we cannot use that instead?

no specific reason, I think when I was going thru the provider code I read somewhere that v2 should not be used

[jacobbednarz]

you may have misunderstood; the Terraform SDKv2 shouldn't be used. the v2 Go library is where we are moving towards.

we can merge this since it's already done but the Terraform provider should use v2 where possible (as that is what we're using going forward).

[brennoo]

yep it is clear to me I mixed the V2s - if you think there is value in it feel free to merge - I will get back to the provider and when I start something I will use V2 Go library

thanks Jacob!