Taking a look at not passing the wallet to the builder

[thunderbiscuit]

This is just for exploration purposes. I was trying to figure out if there is value in passing to the builder just what we need instead of the whole wallet object.

It certainly makes the call site more complex.

fn build_with_wallet(
    self,
    txout_index: KeychainTxOutIndex<KeychainKind>,
    chain_tip: CheckPoint,
    network: Network,
    scan_type: ScanType,
) -> Result<LightClient, BuilderError>;