fix(core): use regular imports instead of require to load plugins

[ghiscoding]

• this also fixes RequireJS missing plugin imports with ESM Module
• replace all require(plugin) since that is not tree shakable and imports are

[codecov]

Codecov Report

Merging #209 (19a0873) into master (3b3b463) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master      #209    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          207       207            
  Lines        11904     11847    -57     
  Branches      3916      4053   +137     
==========================================
- Hits         11904     11847    -57     

Impacted Files	Coverage Δ
packages/common/src/extensions/extensionUtility.ts	100.00% <ø> (ø)
...ages/common/src/extensions/autoTooltipExtension.ts	100.00% <100.00%> (ø)
...src/extensions/cellExternalCopyManagerExtension.ts	100.00% <100.00%> (ø)
...ackages/common/src/extensions/cellMenuExtension.ts	100.00% <100.00%> (ø)
...common/src/extensions/checkboxSelectorExtension.ts	100.00% <100.00%> (ø)
...ges/common/src/extensions/columnPickerExtension.ts	100.00% <100.00%> (ø)
...ages/common/src/extensions/contextMenuExtension.ts	100.00% <100.00%> (ø)
...ommon/src/extensions/draggableGroupingExtension.ts	100.00% <100.00%> (ø)
...ackages/common/src/extensions/gridMenuExtension.ts	100.00% <100.00%> (ø)
...ges/common/src/extensions/headerButtonExtension.ts	100.00% <100.00%> (ø)
... and 4 more

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