Add size limit to Move objects

[lxfind]

trafficstars

We should come up with a reasonable limit for Move objects. We can also consider having different limits for objects and packages. note: we may want to special handle the object 0x5 as it's the system object

[todd-mystenlabs]

I think this needs to be in by Testnet wave 1.

@sblackshear, @lxfind - I think we want to make this no larger than aggregate size of 1 MB for an object, but we can discuss if it might need to be lower.

[oxade]

From talking to @sblackshear it seems the current proposal is 2MB now.

[SuiSunbeam]

Closed with https://github.com/MystenLabs/sui/pull/6328?