feat(Aztec.nr): Auto import all crucial imports from the aztec library required when using the macros

[Maddiaa0]

Currently; compilation will fail if the user has not included imports to the structures required. The following imports are required:

use aztec::abi;
use aztec::abi::{
         Hasher,
         PrivateContextInputs,
         PublicContextInputs
};
use aztec::context::{
     PublicContext,
     PrivateContext
};

Compilation fails without this, and should be hidden

Tracked by #1891