Add table block

[fmontes]

Is your feature request related to a problem? Please describe. As a user, I want to be able to create tables in the block editor.

Describe the solution you'd like Users should select table block from the block menu as any other block.

Describe alternatives you've considered N/A

Additional context

• We need to figure it out how to handle column width in relative units

UI/UX

• Design
• Prototype

https://user-images.githubusercontent.com/751424/167648909-a8170371-7d0b-4d3c-a533-fb83b81bd8a2.mp4