[node] Hook up map-wide "crossSourceCollisions" option, defaulting to true.
[test] Pass "crossSourceCollisions" test option through test harness; enable cross-source-collisions tests on native.
Don't mark items that are outside the collision grid range as placed.
Requires new ignore because GL JS issue #5654 allows insertion of symbols outside the CollisionIndex range, and those symbols can cascade in to affect items within the viewport.
- Adds early exiting "hitTest" query for fast collision detection
- GridIndex now determines cell count separately for x and y axes based on grid dimensions.