Prettify on large responses UI improvements

[bebiksior]

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Bug description

When prettifying large responses, it takes a few seconds, and the response editor stays empty while it’s working. This is really annoying, especially when scrolling through requests on the HTTP History page. It would be much better if there was a loading animation or some text saying it’s still processing

How to reproduce

1. Send this HTTP request in replay:

GET /us/en/ HTTP/1.1
Host: acrobat.adobe.com
Connection: keep-alive
Cache-Control: max-age=0
sec-ch-ua-platform: "macOS"

2. Turn Prettify on the Response editor