Request/Response Tab Manager

Description

At the moment, the Body Tab in the Request and Response panel automatically determines the Content-Type and do "Pretty" and "Highlight". However, in some cases, it doesn't work well if the Response's Content-Type is not correct.

For instance, some users report that their server returns JSON as a body, but Content-Type is text/html, so Proxyman couldn't do Prettier and Highlight.

In order to mitigate this problem, I would like to introduce a feature to handle the Tab in the Request and Response. So the user can select JSON or another format on their need.

Charles Proxy does it very well. We should inspire and support in Proxyman.

Acceptance Criteria

• Add a cog menu button on the Response panel
• Able to select/unselect the format the need
• The selected tab is appended
• Do proper prettier and hightlighter