feat: chaining of txs

[will-break-it]

• simple extension for tx_complete type API to support chaining of transactions
• added test case

Example:
One can chain any complete transaction by using the newly available chain API, which takes a function to select one or more transaction output(s) of tx1 that shall be used an inputs for tx2. These outputs can be script or wallet outputs.

const tx1 = await lucid.newTx()
   .payToAddress('addr_test...', { lovelace: 2_000_000n })
   .complete();

const tx2 = await tx1
    .chain(utxos => utxos.find(({ address }) => address === 'addr_test...')!) // filter tx1 outputs to be chained by some predicate of your choice
    .payToAddress('addr_test...', { lovelace: 2_000_000n })
    .payToAddress('addr_test...', { lovelace: 2_000_000n })
    .complete();

[gavinharris-dev]

Hi @will991 - When chaining do you filter out any 'spent' UTxOs from the UTxO set? I appreciate that this is not an RFC, however I was thinking that the complete method should (with an option):

1. Remove any UTxO(s) that have been spent within the Completed Transaction;
2. Add into the UTxO set any new UTxO(s) that would be created at the Wallet Address

Node: This is all predicated on the idea that with Lucid selectWallet* methods configure Lucid with a single 'address'.

[will-break-it]

@gavinharris-dev
The current state of available UTxOs is stored here. And it is updated based on the Tx outputs matched by payment credentials here.

Hope that helps!