Rename MaxWidth enum to Width

[zepfietje]

I think we initially used MaxWidth because it matches the sizing scale of Tailwind's max width utility class. However, the other day they copied that over to the width utility too. Not all APIs in Filament that accept the MaxWidth enum actually concern the max width, rather the fixed with of an element. Therefore I suggest we rename the MaxWidth enum to Width in v4.

Donate 💰 to fund this issue

• You can donate funding to this issue. We receive the money once the issue is completed & confirmed by you.
• 100% of the funding will be distributed between the Filament core team to run all aspects of the project.
• Thank you in advance for helping us make maintenance sustainable!