2586 - Added new method `resetDirtyRow` allowing to reset dirty state for an specific row

[fabiojpoli]

Explain the details for making this change. What existing problem does the pull request solve? When adding the method resetDirtyRow it allows to reset dirty state on cells only for a specific row instead of the whole grid. This is interesting when is editing a single record and sync with the server by saving the specific row only. When the server return success, we want to deal with that record only.

Related github/jira issue (required): Closes #2586

Steps necessary to review your pull request (required):

• Run grid editable example
• Change some records line row 1, 2 and 3
• Call the method grid.resetDirtyRow(1)
• It will reset only the second row of the grid and other records will keep the dirty state.

Included in this Pull Request:

• [X] Some documentation for the feature.
• [X] A test for the bug or feature.
• [X] A note to the change log.