Improve Org Differences view by grouping metadata by category.

[PawelWozniak]

Trying to use the source tracking feature.
I have clicked on the red-marked area on the status bar to see conflicts

Then Org difference has been opened, which is basically a mix of metadata without any structure. It is very hard to dig through that as the metadata are totally mixed.

Please:

1. Add grouping in the same form as we have in force-app folder. Objects, profiles etc. as a tree structure.
2. Sort metadata alphabetically.

So we can review them by category.