Update k6 dependency and JS module structure to v0.35.0

[imiric]

Closes #121

[CLAassistant]

All committers have signed the CLA.

[robingustafsson]

Code LGTM, but I haven't dug into the new module API yet. I do think we eventually should switch to exporting the BrowserTypes explicitly like Playwright:

import { chromium, firefox, webkit } from "k6/x/browser";

const browser = chromium.launch(opts);

rather than our current:

import launcher from "k6/x/browser";

const browser = launcher.launch('chromium', opts);

This PR also reminded me that we need to fix our "devices" list so you'd ideally be able to write:

import { chromium, devices } from "k6/x/browser";

const browser = chromium.launch(opts);
const context = browser.newContext({ ...devices['iPhone 13'] });

I'll create an issue about it...

[inancgumus]

LGTM, we just need to fix the comments.