[RPC] Add query options to listunspent rpc call.

[furszy]

Adaptation of bitcoin#8952

This PR adds a new optional JSON options for listunspent RPC call:

• Return unspents greater or equal than a specific amount in PIV: minimumAmount.
• Return unspents lower or equal than a specific amount in PIV: maximumAmount.
• Return unspents with a total number lower or equal than a specific number: maximumCount.
• Return unspents which total is greater or equal than a specific amount in PIV: minimumSumAmount.

> pivx-cli help listunspent
...
5. query options    (json, optional) JSON with query options
    {
      "minimumAmount"    (numeric or string, default=0) Minimum value of each UTXO in PIV
      "maximumAmount"    (numeric or string, default=unlimited) Maximum value of each UTXO in PIV
      "maximumCount"     (numeric or string, default=0=unlimited) Maximum number of UTXOs
      "minimumSumAmount" (numeric or string, default=unlimited) Minimum sum value all UTXOs in PIV
    }
...

[random-zebra]

Tested ACK.
I've added functional testing and release-notes here. Feel free to pick if you want.

[furszy]

nice zebra ☕ , functional test + doc commits merged 👌.
Plus rebased on master due conflicts in the release-notes.

[random-zebra]

ACK 063abcf

[Fuzzbawls]

ACK 063abcf