Add support for "jump to" in DB object tree

[eug3nix]

Similar to what VS code and other IDEs do - show the search bar which can do fuzzy search. Display matches along with their types (table, view, function, database etc). Clicking on the item in the search results should select and expand the corresponding node in the tree.
Gotchas:
We may not have all the necessary information to search through when a fresh workspaces is opened since DB tree information is loaded lazily. Decide how to handle that. Possible solutions: use DB-meta as complimentary data source. Maybe eager-load the selected database sub-tree.
To-Do: define in detail.