Added the Helper Methods, Deleting and Keyboard Navigation

[ShaliniSF79]

• Included the Migration guidelines for the Commands
• Added the Commands and Command Parameter
• Provided the Delete Key support for deleting the row
• Included the disable support for the Keyboard Navigation.

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: AllowDeleting

[SyncfusionBuild]

CI Status: SUCCESS ✅
Source Compilation: SUCCESS ✅
Build Location: AllowDeleting
Image Alt Text Error(s): 0
Image Size Error(s): 0
Image Name Error(s): 0
FT Layout Syntax Error(s): 0
Front matter Error(s): 0
File Path Error(s): 0
CodeSnippet File Path Missing Error(s): 0
Toc Anchor Tags Validation Error(s): 0

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: AllowDeleting

[SyncfusionBuild]

CI Status: SUCCESS ✅
Source Compilation: SUCCESS ✅
Build Location: AllowDeleting
Image Alt Text Error(s): 0
Image Size Error(s): 0
Image Name Error(s): 0
FT Layout Syntax Error(s): 0
Front matter Error(s): 0
File Path Error(s): 0
CodeSnippet File Path Missing Error(s): 0
Toc Anchor Tags Validation Error(s): 0