fix(a11y): arrow navigation & focus should work on sub-menus

[ghiscoding]

open context menu via mouse then use arrow navigation only. When I first implemented a11y, I forgot to test with sub-menus and yeah they didn't work at all, so this PR fixes that area as well. On a menu that has children, user can click on arrow right or Enter to open sub-menu, user can then do the inverse to close sub-menu via arrow left

[pkg-pr-new]

angular-slickgrid

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aurelia-slickgrid

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slickgrid-react

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slickgrid-vue

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@slickgrid-universal/angular-row-detail-plugin

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@slickgrid-universal/aurelia-row-detail-plugin

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@slickgrid-universal/react-row-detail-plugin

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@slickgrid-universal/vue-row-detail-plugin

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@slickgrid-universal/binding

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@slickgrid-universal/common

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@slickgrid-universal/composite-editor-component

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@slickgrid-universal/custom-footer-component

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@slickgrid-universal/custom-tooltip-plugin

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@slickgrid-universal/empty-warning-component

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@slickgrid-universal/event-pub-sub

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@slickgrid-universal/excel-export

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@slickgrid-universal/graphql

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@slickgrid-universal/odata

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@slickgrid-universal/pagination-component

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@slickgrid-universal/pdf-export

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@slickgrid-universal/row-detail-view-plugin

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@slickgrid-universal/rxjs-observable

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@slickgrid-universal/text-export

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@slickgrid-universal/utils

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@slickgrid-universal/vanilla-bundle

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@slickgrid-universal/vanilla-force-bundle

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commit: 9098bd2

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (bbb5b70) to head (1117500).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2415   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files         196      196           
  Lines       24248    24298   +50     
  Branches     8488     8510   +22     
=======================================
+ Hits        24248    24298   +50     

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

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[github-actions]

🎉 This pull request is included in version 10.0.0 📦
🔗 The release notes are available at: GitHub Release 🚀