File Content Viewer for Bind Mounts

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Is your feature request related to a problem? Please describe the problem.

When adding bind mounts that refers to a file, and not a directory, it can be really useful to see what the file contents that actually got mounted into teh container is - particularly when combined with `IAspireStore` which generates random file names as the contents change, so you can't just keep the file open in another VS Code window.

### Describe the solution you'd like

When viewing a bind mount in the Resource details pane

It would be amazing if a visualiser could show the file contents, rather than the string of the file path - something like:

### Additional context

It would be awesome if the visualiser allowed editing the file, but I could see that being more trouble than it's worth.