fix(build): add DOM purify optional default import to fix rollup builds

[ghiscoding]

No description provided.

[codecov]

Codecov Report

Merging #858 (25091d0) into master (f74a654) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #858   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           12        12           
  Lines         1002      1002           
  Branches       325       326    +1     
=========================================
  Hits          1002      1002           

Impacted Files	Coverage Δ
...lar-slickgrid/extensions/rowDetailViewExtension.ts	100.00% <100.00%> (ø)

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