## Summary
This commit refactors some of the flags of cloudflared to their own module, so that they can be used across the code without requiring to literal strings which are much more error prone.
Closes TUN-8914
path methods are used for url operations.
filepath methods are used for file system paths and its cross platform.
Remove strings.HasSuffix and used filepath.Ext and path.Ext for file and url extenstions respectively
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`.
gofastasf
João "Pisco" Fernandes
Devin Carr