Browser-only file search

[robertjndw]

What it does

Currently, browser-only file search was not possible due to the lack of @vscode/ripgrep in an environment without Node support. This PR implements file search using the browser-only FileSystemProvider and minimatch.
This implementation was necessary because some VSCode API weren't working correctly for Web Extensions (e.g. vscode.workspace.findFiles())

How to test

1. Open a in-browser Project multiple files
2. Hit CMD + P to open the file search
3. Enter a file name or a pattern

Follow-ups

The workspace search is currently not working for a similar problem as it uses @vscode/ripgrep too.

Breaking changes

• This PR introduces breaking changes and requires careful review. If yes, the breaking changes section in the changelog has been updated.

Attribution

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with the review guidelines