Return a path in requests for CDP proxy

[connor4312]

Instead of returning { host: '127.0.0.1', port: 1337 }, we will return { host: '127.0.0.1', port: 1337, path: '/somepathhere' }.

Adding a path here:

• Would let us run multiple proxies through the same server
• Adds security to prevent random processes on the machine from being able to elevate into the browser context
• Could allow us to selectively share the a secure path with extensions if we develop an extension trust model