add ListDeviceSettingsPolicies

[broswen]

Description

Resolves #1381
Adds a method to list device settings policies.

Has your change been tested?

Added unit tests

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 in cloudflare/api-schemas and relies on stable APIs.
  • The documentation doesn't list the pagination parameters in the request but does show them in result_info for responses. So I'm assuming they follow the existing conventions.

[github-actions]

changelog detected ✅

[github-actions]

This functionality has been released in v0.81.0.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!