💡Release cloudflared as shared library.

[bobaoapae]

When adding cloudflared in applications to proxy tcp traffic, currently it's needed to build logic inside the application to spawn the cloudflared binarie in order to get the connection to work. This add a layer of complexity in monitoring the child process lifecicle and increase the resource usage on the machine in some cases too.

Would be awesome if cloudflared could be released as a library with public api available to be consumed by anyone importing the library.

Examples:
build app for IOS/Android (Like a game) and use raw tcp via cloudflared instead of need to use websocket just to proxy via cloudflared public end point.
manage multiple sockets connection in desktop applications without need of a buch of child proccess.

Related others issues:

#986
#605
#196