Add Typography prop disabled

[spiritualfather]

• I have searched the issues of this repository and believe that this is not a duplicate.

Summary 💡

If we give the Typography a prop of disabled, this will be shown as a disabled label.

Examples 🌈

Code example

<Typography disabled variant="body1">
         Example
 </Typography>

How would it change the text?

instead of

Motivation 🔦

I'm making a question in a form where some of the answers you will need to fill more than just a text field.
Therefore, if someone chooses question one, then question two and three are disabled.
If someone chooses question two and needs to fill the date, then the text fields (and labels) are disabled.

[oliviertassinari]

I think that it will come with #15561.