Inspector support - Githubissues

Problem

There are a few features in the inspector that require modifications to MRjs for cleaner integration. so far it's:

inspect flag: when enabled, all interaction events are overridden. pointer-events: none is also overridden so all entities in the scene can be inspected.
iFrame relative raycasting: the pointer raycast was relative to the window size and not the app canvas size, resulting in an unexpected offset under certain conditions

Notes and any associated research or links

[x] PASS - all necessary actions must pass (excluding the auto-skipped ones)
[x] TEST IN HEADSET - main dev-testing-example and any of the other examples still work as expected
[ ] VIDEO - if this pr changes something visually - post a video here of it in headset-MR and/or on desktop (depending on what it affects) for the reviewer to reference.
[x] TITLE - make sure the pr's title is updated appropriately as it will be used to name the commit on merge
[ ] BREAKING CHANGE
- DOCUMENTATION: This includes any changes to html tags and their components
- make a pr in the documentation repo that updates the manual docs to match the breaking change
- link the pr of the documentation repo here: #pr
- that pr must be approved by @lobau
- SAMPLES/INDEX.HTML: This includes any changes (html tags or otherwise) that must be done to our landing page submodule as an effect of this pr's updates
- make a pr in the mrjs landing page repo that updates the landing page to match the breaking change
- link the pr of the landing page repo here: #pr
- that pr must be approved by @hanbollar