This PR is for the first item listed in #559: `Expand All / Collapse All
Categories`

For the expand / collapse all categories functionality, I was choosing
between having a single `Expand / collapse all categories` button or one
for each: `Expand all categories` and `Collapse all categories` buttons.

For the initial implementation, I have opted with the latter. Please let
me know which one is the right way to go or if there are other
suggestions and I'll just accordingly.


![image](https://github.com/actualbudget/actual/assets/20313680/64d0e498-1139-4dd0-9b7f-4d478ab947aa)