Open Project Files on click

[dotNomad]

This PR adds a new webview to host message for vscode.open allowing the Project Files view to open files on click.

Intent

Part of #1344

Type of Change

• • Bug Fix
• • New Feature
• • Breaking Change
• • Documentation
• • Refactor
• • Tooling

[sagerb]

This looks good to me. I only had one comment regarding some overlap with what I've implemented (but not yet pushed a PR on). Let me know what you want to do.

[sagerb]

Not surprising, this functionality overlaps with some that I needed to implement to open the current requirements file. Unfortunately, I do not have a complete path to the file, so I implemented my handler as a relative path, which is then turned into a full path uri.

You obviously have the absolute path, so you don't need it, but I was wondering if we want to modify this message with a boolean parameter for relative or not. I could certainly do this in my merging of your implementation into mine, but I wanted to mention it.

Or we could go the route of relative paths only and send that up, with the host turning it into a full path uri.

[dotNomad]

I think having a raw vscode.open that has the same URI parameter and another message like relative.vscode.open that takes a relative file name in the content and knows to transform it could work.

That would give us both options.