onFocus handle to focus tabbed blocks

[Wagner3UB]

The focus issue when entering a block using the Tab key has been fixed. Now, the onFocus function works similarly to the onClick function, giving focus to the block and activating the visible border and functional buttons (drag, delete, and add block).

To reproduce this issue: 1-Enter edit mode 2-Press Tab to move from the title to the first block 3-Go back to the title by pressing the Up Arrow key 4-Press Tab again

-Without this fix, the focus would not appear on the block.

P.S.: At this point, the focus is trapped and those buttons are not accessible yet, we can change block pressing arrow up/down, but those buttons aren't focusable. This will be fixed soon (I hope).

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