wip-feat(renderingEngine): per viewport rendering engine flag

[IbrahimCSAE]

issues:

• cornerstone3D tools that assume a single rendering engine, like some synchronizers, reference lines tool etc
• max webgl active contexts is 16, so 16 viewports only
• volume viewports need to share the same engine

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[cypress]

Viewers    Run #5159

Run Properties:   Failed #5159  •  b7a4b271f5: fix

Project	Viewers
Branch Review	feat/multi-render-engine
Run status	Failed #5159
Run duration	02m 38s
Commit	b7a4b271f5: fix
Committer	Ibrahim
View all properties for this run ↗︎

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Test results
Failures	11
Flaky	0
Pending	2
Skipped	14
Passing	13
View all changes introduced in this branch ↗︎

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Tests for review

  customization/HangingProtocol.spec.js • 2 failed tests

View Output Video

Test		Artifacts
OHIF HP > Should navigate next/previous stage		Test Replay Screenshots Video
OHIF HP > Should navigate to display set specified		Test Replay Screenshots Video

  measurement-tracking/OHIFCornerstoneToolbar.spec.js • 1 failed test

View Output Video

Test		Artifacts
OHIF Cornerstone Toolbar > checks if all primary buttons are being displayed		Test Replay Screenshots Video

  measurement-tracking/OHIFMeasurementPanel.spec.js • 1 failed test

View Output Video

Test		Artifacts
OHIF Measurement Panel > checks if Measurements right panel can be hidden/displayed		Test Replay Screenshots Video

  measurement-tracking/OHIFStudyBrowser.spec.js • 1 failed test

View Output Video

Test		Artifacts
OHIF Study Browser > checks if series thumbnails are being displayed		Test Replay Screenshots Video

  measurement-tracking/OHIFCornerstoneHotkeys.spec.js • 1 failed test

View Output Video

Test		Artifacts
OHIF Cornerstone Hotkeys > checks if hotkeys "R" and "L" can rotate the image		Test Replay Screenshots Video

The first 5 failed specs are shown, see all 10 specs in Cypress Cloud.