Add referrer field for TON staking tx

[welldan97]

Adding referrer for TON tx for tracking.

To parse those fields from transactions, you can use:

const txStatus = await this.getTxStatus({
  address: 'kQDeHoxmpJ6dzzl7KyHDQuOSkwvEnXMcs-8gMCJOSo-IpTrj',
  txHash: '37fd26a86aafd6fb05953655a0ecbe7ba5f1955002f105127359555f5151e733'
})

const body = txStatus.receipt?.outMessages.get(0)?.body.beginParse()
const op = body.loadUint(32)
const queryId = body.loadUint(64)
const gas = body.loadCoins()
const referrer = body.loadStringTail()
console.log({
  op,
  queryId,
  gas,
  referrer
})

Output:

{
  op: 2077040623,
  queryId: 4090730133165079,
  gas: 100000n,
  referrer: 'Hello TON!!!'
}

Tx:

https://testnet.tonviewer.com/transaction/37fd26a86aafd6fb05953655a0ecbe7ba5f1955002f105127359555f5151e733?section=trace

[mkaczanowski]

LGTM