fix(plugin): recreate header menu w/adding column dynamically, fix #689

[ghiscoding]

• fixes #689

TODOs

• push a fix
• add unit tests
• add E2E Cypress tests

[codecov]

Codecov Report

Merging #690 (7105dea) into master (277e627) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #690   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          157       157           
  Lines        10473     10474    +1     
  Branches      3680      3681    +1     
=========================================
+ Hits         10473     10474    +1     

Impacted Files	Coverage Δ
...es/angular-slickgrid/services/extension.service.ts	100.00% <100.00%> (ø)

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