fix(a11y): align submenu arrow keys and Escape behavior with ARIA

[ghiscoding]

fixes an issue with sub-menu that didn't open when sub-menu is expected to open on the left (e.g. if we open our menu from the right far side of the grid) and we use the arrow right key, it should always open sub-menu with arrow right (even if menu opens on the left side). Also left arrow key is always considered as a key to close current sub-menu.

This follows ARIA patterns described in this article:
https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Reference/Roles/menu_role

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (a77150e) to head (ff4ac92).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2426   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files         196      196           
  Lines       24318    24318           
  Branches     8518     8519    +1     
=======================================
  Hits        24318    24318           

Flag	Coverage Δ
angular	100.0% <ø> (ø)
universal	100.0% <100.0%> (ø)

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commit: e5ce2f3

[github-actions]

🎉 This pull request is included in version 10.1.0 📦
🔗 The release notes are available at: GitHub Release 🚀