DS-12153 support custom fields for logging

[nuggien]

Description

This adds support for custom fields logging to the action parameters field of the ruleset api.

Has your change been tested?

This has been tested against an updated version of the cloudflare terraform provider.

Screenshots (if appropriate):

Types of changes

What sort of change does your code introduce/modify?

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

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• This change is using publicly documented (api.cloudflare.com or developers.cloudflare.com) and stable APIs.

[cmackenzie1]

LGTM.