[feature] Add support for Cloudflare API Tokens

[inthenightsky]

Is your feature request related to a problem? Please describe.
The current format can be clunky when used in an enterprise setting, as a standard user has access to several accounts and Cloudlist doesn't have a way to filter your findings when it comes to Cloudflare on a per-zone level. Whilst Cloudflare API tokens would help, they aren't supported in this project.

Describe the solution you'd like
I would like for the project to support Cloudflare API tokens. This would allow me to finely scope API tokens on a per-zone, per-account basis to ensure it's only doing what it needs to.

[ehsandeep]

@inthenightsky, thanks for this feature request, now you can optionally pass the Cloudflare token with #327