Add Selenium downloadFile command

[ccharnkij]

Proposed changes

This change adds all 3 of Selenium Grid download command. For downloadFile, the logic is pretty much straight from Selenium JS binding

Types of changes

• Polish (an improvement for an existing feature)
• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (improvements to the project's docs)
• Specification changes (updates to WebDriver command specifications)
• Internal updates (everything related to internal scripts, governance documentation and CI files)

Checklist

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation (if appropriate)
• I have added proper type definitions for new commands (if appropriate)

Further comments

If needed and this is good, I can make the same change for main as well.

#12671

Reviewers: @webdriverio/project-committers

[christian-bromann]

Thanks for raising the PR!

If needed and this is good, I can make the same change for main as well.

Yes please!

[christian-bromann]

Some more comments

[ccharnkij]

@christian-bromann I've made the changes you suggested. Please check again. For Safari, it doesn't seem like this feature is available. I've tried to setup local grid on my mac and noticed that Safari didn't have the download capability like the other 3 browsers.

[christian-bromann]

Two more comments.

[ccharnkij]

@christian-bromann better?

[christian-bromann]

👍

[christian-bromann]

Mind providing the same PR for the main branch?

[christian-bromann]

@ccharnkij mind rebasing the branch?

[christian-bromann]

Thanks again for helping us backport this feature.