TTD - Improve scanning of well known persistent pointers

We currently use a workaround in TTRuntimeInfoTracker.cpp to scan and track well known persistent pointers. This doesn't scale well and is currently missing a number of properties on JavascriptLibraryBase.

Ideally we would like a "JsWellKnownObject" macro + list of fields that would notify us of what these fields/objects are (and give us stable names/ids for them).

See #2309 for more info.

Start with TTRuntimeInfoTracker.cpp and read issue #2309 for the background on persistent-pointer scanning. Trace how JavascriptLibraryBase properties are currently discovered, then define completion around stable names or IDs being available for all well-known persistent pointers without the current workaround.

Written by the indexing model from the issue text.