Improve debugger file search UX

From an internal user:

The current fuzzy search experience has some usability issues.

The expand if < 5 results often times hides useful information due to repeated matches from generated files
Folders do not stay expanded on new search

We should try to take better advantage of the space and save the user a click when possible,

ex1) always show the top X results from each folder expanded with show more... as the final options.
ex2) dont seperate by folder

@bkonyi

After an offline discussion, here are some improvements we will make to the libraries pane, search experience, and history picker

remove filter text field from libraries view (@bkonyi working on this in Replace ScriptPicker with ProgramExplorer on DebuggerScreen #3227)
~~(internally) add edited files to the top of the libraries view with a subheader and a separator between those files and the rest~~ - now tracked at Prioritize edited / recently viewed files for file explorer and search in the debugger #3383
convert the libraries view to be a tree file explorer (@bkonyi working on this in Replace ScriptPicker with ProgramExplorer on DebuggerScreen #3227)
search will become a hotkey (cmd + p or cmd + o) that launches a modal dialog where a query can be entered and search results will be populated for the user to select
~~remove duplicate entries in history picker~~ - no longer able to reproduce
~~color edited files a different color (maybe blue like IntelliJ) in the libraries pane and history picker~~ - tracked internally

The remaining work for this is tracked at #3383 and #3418. Closing.

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