Add evaluateOnNewDocument method to API

[alexkozy]

I need some data to be synchronously available in app from its start. E.g., I would like to fetch settings from my own storage and inject them to the app by evaluating on new document something like:

evaluateOnNewDocument(`Settings = { a: 1, b: 2, c: 3}`);

I can create file with settings somewhere in temporary directory and then serve it but it looks much less convenient.

[pavelfeldman]

You should be able to serve this via network interception now.