feat: convenient method to get address(this)

[LHerskind]

Add a convenient way to get the address of the current contract. The data should be available in the CallContext which is part of PrivateContextInputs which is in the Context.

Consider whether it is useful to have separate portal utility for this (get portal address) or if if it sufficient with current address together with #1464.

[iAmMichaelConnor]

I'd recommend exposing this as a method of the Context struct. If the only low-level aztecy struct a dev ever needs to touch is the Context, that would be preferable.

E.g. inside impl Context { }

fn this_address(self) -> Field {
    self.inputs.call_context.storage_contract_address
}

[iAmMichaelConnor]

Similar methods (on the Context) for msg_sender(), this_portal_address() would also be lovely 'quick wins'.

[Maddiaa0]

Similar methods (on the Context) for msg_sender(), this_portal_address() would also be lovely 'quick wins'.

https://github.com/AztecProtocol/aztec-packages/blob/6688ca728c2103e4987168d505d18cb2eed7d95c/yarn-project/noir-libs/noir-aztec/src/context.nr#L103C1-L109C6

It appears that they already exist

[Maddiaa0]

closing in this case

[iAmMichaelConnor]

It appears that they already exist

Git blame says I added these yesterday. I do not remember doing this. Well... I remember thinking it... but then seeing this issue made me assume I hadn't actually done it.