fix(sorting): add cellValueCouldBeUndefined in grid option for sorting

[ghiscoding]

• Salesforce very often removes property of an object if it's detected as null and this becomes undefined in slickgrid, add a salesforce global grid options to deal with these undefined property

[codecov]

Codecov Report

Merging #202 (89ab85a) into master (1b1cea2) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master      #202    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          206       206            
  Lines        11853     11854     +1     
  Branches      4054      3905   -149     
==========================================
+ Hits         11853     11854     +1     

Impacted Files	Coverage Δ
packages/common/src/services/collection.service.ts	100.00% <100.00%> (ø)
packages/common/src/services/sort.service.ts	100.00% <100.00%> (ø)
packages/common/src/sortComparers/dateUtilities.ts	100.00% <100.00%> (ø)
...es/common/src/sortComparers/numericSortComparer.ts	100.00% <100.00%> (ø)
...mmon/src/sortComparers/objectStringSortComparer.ts	100.00% <100.00%> (ø)
packages/common/src/sortComparers/sortUtilities.ts	100.00% <100.00%> (ø)
...ges/common/src/sortComparers/stringSortComparer.ts	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1b1cea2...89ab85a. Read the comment docs.