Add CLI support with auto-auth helper command

[dhleong]

Includes a CLI that can be installed globally supporting:

babbling auto-auth  
babbling cast <url>

• auto-auth Reads cookies and tokens from Chrome into a config file to enable easier PlayerBuilder instantiation, and also enables the babbling cast command

In addition, so you don't have to specify the device every time you can use:

babbling config device "My Chromecast"

for example, to always cast to a device called "My Chromecast."

Once auto-auth is complete, you can acquire a PlayerBuilder with all apps authenticated using:

const builder = await PlayerBuilder.autoInflate()

// we don't yet use the `device` config, so add it:
builder.addDevice(new ChromecastDevice("My Chromecast"));

// add extra config if desired (it gets merged)
builder.withApp(YoutubeApp, { deviceName: "Smart Home" });

// done!
builder.build();

Babbling will handle the file reading and app auth for you!