Before this commit the commands that listed tunnels and tunnel routes would be limited to 1000 results by the server.
Now, the commands will call the endpoints until the result set is exhausted. This can take a long time if there are
thousands of pages available, since each request is executed synchronously.
From a user's perspective, nothing changes.
## Summary
Previously the force flag in the tunnel delete command was only explicitly deleting the
connections of a tunnel. Therefore, we are changing it to use the cascade query parameter
supported by the API. That parameter will delegate to the server the deletion of the tunnel
dependencies implicitly instead of the client doing it explicitly. This means that not only
the connections will get deleted, but also the tunnel routes, ensuring that no dependencies
are left without a non-deleted tunnel.
cloudflared tail will now fetch the management token from by making
a request to the Cloudflare API using the cert.pem (acquired from
cloudflared login).
Refactored some of the credentials code into it's own package as
to allow for easier use between subcommands outside of
`cloudflared tunnel`.