Use address in the wallet config for module initialization during genesis

[666lcz]

Problem

The oracle object for SuiEcho needs to be transferred to some trusted address during module initialization in genesis

sui/sui_programmability/framework/sources/CrossChainAirdrop.move

Lines 59 to 68 in 03d1e84

	fun init(ctx: &mut TxContext) {
	let oracle = oracle_address();
	Transfer::transfer(
	CrossChainAirdropOracle {
	id: TxContext::new_id(ctx),
	managed_contracts: Vector::empty(),
	},
	oracle
	)
	}

Right now we are using a hardcoded address, and this presents a few problems:

1. To be able to test the flow in Rust, we need to expose the private key of this address
2. At the moment, the REST server owns the wallet(subject to change), and it's unsafe to transmit the private key of this oracle address from the oracle server to the REST server over the network.

Solution

We will transfer the oracle object to the address that initializes the modules during genesis. The question is what should this genesis address be?

Right now this address is default to be "0x00...000". This PR replaces it with the last address in the wallet config so that the oracle object can be transferred to an address controlled by the wallet. This is a simple but temporary solution that unblocks GDC.

After we are done with the migration to manage keys on client(as opposed to the REST server), the client should specify the address they want to use for initializing modules when calling /genesis

[patrickkuo]

It's a bit hacky here, will need to revisit this after GDC.

Code LGTM, agree to unblock.