pass custom extra on payment out

[talvasconcelos]

Allow extra to get passed when making a payment.

{
  "unit": "sat",
  "out": true,
  "extra": {
      "orderId":"3l4k23j4k2l3j34",
      "tag":"FEES"
  },
  "bolt11": "lnbc10u...0p8da5"
}

on the payments will show:

{
  "paid": true,
  "preimage": "0...000",
  "details": {
    "checking_id": "ede3426...93bb8d6",
    "pending": false,
    "amount": -1000000,
    ...
    "expiry": 1699445241,
    "extra": {
      "orderId": "3l4k23j4k2l3j34",
      "tag": "FEES"
    },
    ...
  }
}

Closes #2082

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6a27b91) 60.40% compared to head (c8b0cf3) 60.59%.

❗ Current head c8b0cf3 differs from pull request most recent head 93b27b6. Consider uploading reports for the commit 93b27b6 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2089      +/-   ##
==========================================
+ Coverage   60.40%   60.59%   +0.19%     
==========================================
  Files          56       55       -1     
  Lines        8438     8322     -116     
==========================================
- Hits         5097     5043      -54     
+ Misses       3341     3279      -62     

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