export IPropertiesOptions for use by other libraries or code using docx library

[mayank1513]

Fixes #2978

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (9c60cfc) to head (01763ea).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2979   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          290       290           
  Lines         8764      8764           
  Branches      1413      1413           
=========================================
  Hits          8764      8764           

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