Validate Grid Rows is integer and properly support padding for rows

[snosenzo]

Description

• currently the logic of iterating through the data array does not support padding at the end of rows. It iterates through the data assuming that there is no padding at the end of a row of data.
• Also the row count is calculated by dividing the bytelength by the row_stride without validating that it is an integer. If the value is not an integer it should add an error to the topic