Add a blockConfirmation that handles a transaction confirmation from an event

[molekilla]

Add

const logs = await blockConfirmationUntilTransaction(contract.logEvent, filterOptions)

Returns a Promise of logs

This saves the following code

        const logs = await questContract.logSetQuestOutcome(filterOptions);
        const blockConfirmation = blockConfirmationUntil(questOutcomeResult.txid);
        await blockConfirmation.toPromise();