Add support for downloading the chromedriver after installation

[r3pwn]

Using the .download async function, we can now do things like

await chromedriver.download();
before any tests get run.

Additionally, some options are supported.
We can pass in download_version or cdn_url like such:
await chromedriver.download({cdn_url: "http://localhost", download_version: 84});

download_version is able to be passed in as the full version of chrome ("84.0.4147.105") or just the major version (84)

I believe this is the functionality requested by @HaimBendanan in issue #256

[r3pwn]

The only additional thing that I think may be beneficial to have as a part of this is an exported is_installed function on lib/chromedriver.js which will allow whoever is using it to see if they need to download chromedriver, or if it's set up properly already, but I will wait for feedback.

[giggio]

Wow, this is a large PR, I'll check it out on the weekend.

[r3pwn]

I tested this code using a sample project and adding the following snippet, and it seems to work as intended. Please let me know if you have any questions :)

[r3pwn]

@giggio Have you had the chance to look at this PR?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[r3pwn]

@giggio Did you ever get a chance to look at this?

[bhuber2010]

would love to get this merged as well!

[dboterho]

+1

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.