fix(exports): grid with colspan should export accordingly

[ghiscoding]

• read each item metadata to evaluate if the row has any colspan defined and if so then export them accordingly (in Excel we would merge the cells but in regular text export then we would just return empty string)

TODOs

• should work with Export to Excel
  • with Excel we should merge cells as per the colspan defined
• should work with Export to Text File
  • with Text Export, we should blank any cell not being the first colspan cell
• add full unit test suite coverage

[codecov]

Codecov Report

Merging #311 (cf96197) into master (09a4cd3) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #311   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          212       212           
  Lines        12724     12765   +41     
  Branches      4350      4368   +18     
=========================================
+ Hits         12724     12765   +41     

Impacted Files	Coverage Δ
packages/common/src/services/export-utilities.ts	100.00% <100.00%> (ø)
packages/excel-export/src/excelExport.service.ts	100.00% <100.00%> (ø)
packages/text-export/src/textExport.service.ts	100.00% <100.00%> (ø)

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