✨ Allow directories to be collapsed in the file tree

[RobertBlackhart]

Is your feature request related to a problem? Please describe.
Depending on the number of files and folders on the device, it may be useful to allow collapsing the directories. This makes it easier to focus on the relevant files currently being worked on.

Describe the solution you'd like
Some button or action added to the file tree for directory entries that allows them to be collapsed, which would hide files and folders under them. And then to be expanded again.

Describe alternatives you've considered
None, really. I'm not sure what a good alternative is. The current behavior would be and it works fine.

Additional context
Here's an example when loading the VM of the files that I want to interact with are all at the bottom:

[vshymanskyy]

I believe it would be best to extract the tree view into a separate component, that will handle all that.
Also, specifically for VM, we should auto-collapse the system directories.