Update Tunnel API Structs

[TroyKomodo]

Update the Tunnel (cloudflared) API structs so that they reflect the current API/Cloudflared configs.

Description

Copied changes from cloudflared into this repo.

Currently aswell not sure where to report but the docs (https://api.cloudflare.com/#cloudflare-tunnel-configuration-properties) State that the API returns a JSON string, however this is not the case.

Has your change been tested?

No.

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.

fixes #1098

[github-actions]

Oops! It looks like no changelog entry is attached to this PR. Please include a release note as described in https://github.com/cloudflare/cloudflare-go/blob/master/docs/changelog-process.md.

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[jacobbednarz]

as this field isn't publicly documented, we can't yet accept the PR. before we add fields, they need to be documented to ensure they are intended for public consumption and considered stable.

feel free to raise a Cloudflare support ticket with the details of what is missing and once that is addressed by the service team, we can land this one.

[asychev]

Any updates on ETA?

[TroyKomodo]

I am not sure, I haven't been told anything about the state of this PR

[jacobbednarz]

superseded by #1138