Collapse / Expand request/response components

[ghost]

Is your feature request related to a problem? Please describe.
The request headers take up a lot of space especially when someone sends a GET request and has to scroll down to see the response.

Describe the solution you'd like
Add a caret button on the left of both components that enables a user to expand the component when they want to see more details or collapse it when it is not mainly in use

Describe alternatives you've considered
To display the request and response components vertically as described in #133

Additional context
When both are collapsed they can look like this:

When the response tabs is expanded

When both are expanded

[thewahome]

Closing this as #822 reduces the views to a collapsed state