feat(keyboard): apply modifier state

[ph-fritsche]

What:

Apply modifier state. See https://www.w3.org/TR/uievents/#dom-keyboardevent-getmodifierstate

Why:

Closes #812

How:

Keep track of modifier states on keyboardState.
Apply modifier states on keyboard and pointer events.

Checklist:

• Documentation
• Tests
• Ready to be merged

Additional information:

In the browser e.g. getModifierState('Shift') returns true if shiftKey: true is set on the EventInit.
In Jsdom getModifierState is implemented for e.g. modifierCapsLock but fails for Alt, Control, Meta and Shift.

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[codecov]

Codecov Report

Merging #815 (bb843bc) into beta (684451f) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              beta      #815   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           77        79    +2     
  Lines         1572      1578    +6     
  Branches       556       559    +3     
=========================================
+ Hits          1572      1578    +6     

Impacted Files	Coverage Δ
src/keyboard/index.ts	100.00% <ø> (ø)
src/keyboard/keyMap.ts	100.00% <ø> (ø)
src/keyboard/plugins/index.ts	100.00% <ø> (ø)
src/utils/pointer/firePointerEvents.ts	100.00% <ø> (ø)
src/keyboard/keyboardAction.ts	100.00% <100.00%> (ø)
src/keyboard/plugins/character.ts	100.00% <100.00%> (ø)
src/keyboard/plugins/combination.ts	100.00% <100.00%> (ø)
src/keyboard/plugins/functional.ts	100.00% <100.00%> (ø)
src/keyboard/plugins/modifiers.ts	100.00% <100.00%> (ø)
src/utils/keyboard/getKeyEventProps.ts	100.00% <100.00%> (ø)
... and 1 more

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[github-actions]

🎉 This PR is included in version 14.0.0-beta.4 🎉

The release is available on:

• npm package (@beta dist-tag)
• GitHub release

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