Enable payments in webviews

[dmengelt]

Similar to #165784 it would be great to enable payments (the Payment Request API) for webviews. For VS Code web this works if I add allow="payment" here:

vscode/extensions/simple-browser/src/simpleBrowserView.ts

Line 168 in 969b571

<iframe sandbox="allow-scripts allow-forms allow-same-origin allow-downloads"></iframe>

However, #165784 touches more files and I'm also not sure how to re-generate the SHA here.

Note: The Payment Request API is only available for Chrome, Edge and Safari