frontend/backend: show outputs as individual row for receive transactions

[NicolaLS]

Closes: #1728

Display each output of a receive transaction as one transaction in the app. The outputs data is only added to the endpoint response if the transaction is of type receive. Non-utxo model transactions e.g. ETH will just contain a single item in the outputs field which is weird but fine imo.

In the current implementation the index used for the note key (txid:idx) is set/defined by the order of the Adresses in the TransactionData struct returned by txInfo (here)

• if the logic there changes all notes would be broken
• the way the frontend treats the outputs field right now kind of implies that we are dealing with the actual outpoint/output index of the transaction which is not true and could be confusing when working on the code after some time.

Probably it would be better to add index to TransactionOutput and actually set it to the transactions output index and then use that in the frontend. Let me know if you think the current implementation is fine or if I should change that.

[NicolaLS]

This can be tested by checking out #2844

./scripts/regtest/run_regtest.sh
make servewallet-regtest
make webdev
cd ./scrips/regtest/
export DOCKER_REGTEST=1
source examples.sh
mine_blocks 101
example_bitbox_receive_many