Add keepScrollPosition option to properties

[agubler]

Type: bug

The following has been addressed in the PR:

• [ ] There is a related issue
• [ ] All code has been formatted with prettier as per the readme code style guidelines
• [ ] Unit or Functional tests are included in the PR

Description:

Put the keepScrollPosition in the correct properties interface.

[codecov[bot]]

Codecov Report

Merging #52 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #52   +/-   ##
=======================================
  Coverage   88.48%   88.48%           
=======================================
  Files           4        4           
  Lines         304      304           
  Branches       81       81           
=======================================
  Hits          269      269           
  Misses         35       35

Impacted Files	Coverage Δ
src/dgrid/DgridWrapper.ts	88.41% <ø> (ø)	:arrow_up:

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