Support File Drop for Request Bodies

[SoulKa]

As a user of Trufos, I want to have an appealing file selection area to select a request body file. Currently, there is a raw file input which only allows selecting files using a dialog. Also, the dropdown to switch between text and file can be improved visually (see Figma).

As a developer of Trufos, I also want the file request body input to be a separate component to keep the code clean.

Figma:

Acceptance Criteria

• The file request body is a separate component
• The file request body allows dropping files into it
• The dropdown to switch between text and file is visually improvd