Use postMessage to open external links from sandboxed iframe

[nisargjhaveri]

VS Code's sandboxes the iframes and does not allow popups (see microsoft/vscode#186043). This means none of the <a target="_blank"> links or window.open works when Firefox Profiler is loaded in VS Code.

The suggested workaround is to use postMessage to send the link and use VS Code provided APIs to open the link in external browser. This requires either changing every instance of these APIs, or overriding window.open and intercepting clicks on <a target="_blank"> using global event listener or document or similar.

Would we be open to implement this here? We can activate this mechanism using some query param. Thoughts? Suggestions?

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