feat: add sub-menu(s) to GridMenu plugin

[ghiscoding]

• currently only works by click event on sub-menus, the mouseover will be implemented in a future PR

TODOs

• add full unit test coverage
• add Cypress E2E tests
• sub-menus events are leaking, it needs to be fixed before merging
• it might be nice to add auto-align top/bottom especially for sub-menus
• instead of creating GridMenu then hiding it in the DOM, we should create it on the fly and destroy it when closed, meaning that if the user never clicks on it then we will never add it to the DOM but the previous was creating a GridMenu (and ColumnPicker) for every grids in the page

[codecov]

Codecov Report

Merging #1151 (30bba7f) into master (c9e8327) will not change coverage.
Report is 7 commits behind head on master.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #1151   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          245       245           
  Lines        16997     17075   +78     
  Branches      6113      6151   +38     
=========================================
+ Hits         16997     17075   +78     

Files	Coverage Δ
packages/common/src/extensions/menuBaseClass.ts	100.00% <100.00%> (ø)
...ges/common/src/extensions/menuFromCellBaseClass.ts	100.00% <100.00%> (ø)
...ackages/common/src/extensions/slickColumnPicker.ts	100.00% <100.00%> (ø)
packages/common/src/extensions/slickContextMenu.ts	100.00% <100.00%> (ø)
packages/common/src/extensions/slickGridMenu.ts	100.00% <100.00%> (ø)
...ckages/common/src/services/bindingEvent.service.ts	100.00% <100.00%> (ø)

... and 6 files with indirect coverage changes