Investigate performance issues reported for TS Server

[mjbvz]

Various issues tracking performance concerns:

#21442
#21292
#10439
#17565
#20260
#19997
#18774

[mjbvz]

The major finding from the investigation is this bug: microsoft/TypeScript#14636

This effects any workspace that many folders. Adding an exclude or include to the jsconfig.json or tsconfig.json fixes this in my testing, but we really need a fix on the TS side. No logs or errors are generated in these cases

For other cases, #22915 should make investigation easier as well

Closing out this investigation work item. Will continue following up on the individual performance issues