Enforce type annotations for constants

[IGI-111]

We should ensure all const declarations have explicitly named types and provide a helpful error message when they do not.

const OFFSET_TOKEN_ADDRESS = 32; // forbidden
const OFFSET_TOKEN_ADDRESS: u64 = 32; // allowed

[ikemHood]

I’d like to help with this.

I understand that this is a compiler and you want me to implement that every conts has a well defined type

[cryptogru725]

I’d like to help with this.

[FriendlyLifeguard]

Hello, could I work on this?

[saimeunt]

Following up on my work on #7042 and #7043, I'd like to continue fixing issues on Sway, please assign me.

[Sendi0011]

GM! i will like to work on this. ETA: 24 hours