[Table] Avoid unnecessary re-rendering

[petrjaros]

Please consider this or similar change to improve performance of table re-rendering.
Before this change all table cells are going to re-render no matter the content of the cell changes or not. This improvement has big impact on frequently updating tables where only few cells changes.
See also: https://reactjs.org/docs/context.html#caveats

• I have followed (at least) the PR section of the contributing guide.

[oliviertassinari]

Do you have an example where it can be useful? Thank you!

[petrjaros]

Here is a sample code without the proposed change: https://codesandbox.io/s/3x4ovmmk91
and with the proposed change: https://codesandbox.io/s/8rv4pnpkj

When I measure the performance in Chrome inspector I get much better performance with the second example:
https://3x4ovmmk91.codesandbox.io/ - ~80ms
https://8rv4pnpkj.codesandbox.io/ - ~20ms

[oliviertassinari]

@petrjaros It's a great first pull request on Material-UI 👌🏻. Thank you for working on it!