* added arialable for check all checkboxes and added some missing roles for the table elements
* removed duplicate attribute
* Moved column header aria label logic to a function.
* fixed typos in declarative table
* Changed the aria label text to something that is more intuiive.
* fixed typo in localized string identifier
* -Added check all null checkbox
* Modified declarative table to add check all columns in the column header
* -changed to using existing methods for firing events.
* -changed table height to auto
-center aligned data in table cell
-Check all generates event for only changed values
* -changes column header from text to column header (#10787)
* This fixes the weird angular stuff - we need to do this in every other component
* -added changes made by amir for dom object tracking
-added automatic checkall detection.
-made text-align center in table cells
* -fixed styling issues and issue with checkboxes
* -Removed unsued function
Co-authored-by: Amir Omidi <amomidi@microsoft.com>
