Is your feature request related to a problem? Please describe.

I need to know all the utxos I have in my wallet, including the immature ones. When using listunspent, the immature coinbases are not returned:

❯ bitcoin-cli listtransactions
[
  {
    "address": "bcrt1q0epv47eaxhyenhqcjp8v7wytjx26k35r6w2py6",
    "category": "immature",
    "amount": 50.00000000,
    "label": "",
    "vout": 0,
    "confirmations": 1,
    "generated": true,
    "blockhash": "334996db387320711e1176f2591dfc16fe8d92f617af47ae65b97c2a817758b0",
    "blockheight": 102,
    "blockindex": 0,
    "blocktime": 1658995253,
    "txid": "480f0340a98755cfb095743b5464e87d0cf1b0200d204507ec8448962bcafbe6",
    "walletconflicts": [
    ],
    "time": 1658995253,
    "timereceived": 1658995253,
    "bip125-replaceable": "no"
  }
]
❯ bitcoin-cli listunspent
[
]

Describe the solution you'd like

What do you think of adding a include_immature_coinbase (default to false) parameter to listunspent? If you think it'd be useful, I can start working on this myself.

Describe alternatives you've considered

At the moment I'm calling listtransaction and adding to the utxo list every immature output I see (bitcoindevkit/bdk#687). This works just fine, but having the include_immature parameter would make the code a bit cleaner (and it would save one RPC call!).