Merge #21602: rpc: add additional ban time fields to listbanned

d3b0b08b0f04d2f1dbebbafd7ab0384dfe045dec doc: release notes for new listbanned fields (Jarol Rodriguez)
60290d3f5ec8e7e3b8cb1ebae02d5d72f6005184 test: increase listbanned unit test coverage (Jon Atack)
3e978d1a5dbd43f85bd03e759984ab1f209d6e34 rpc: add time_remaining field to listbanned (Jarol Rodriguez)
5456b345312857981cb426712f0665800c682e09 rpc: add ban_duration field to listbanned (Jarol Rodriguez)
c95c61657afd058b46549fb3d65633d7c736f5fc doc: improve listbanned help (Jarol Rodriguez)
dd3c8eaa3399b28dc78a883ff78cbe7cc5c31b5b rpc: swap position of banned_until and ban_created fields (Jarol Rodriguez)

Pull request description:

  This PR adds a `ban_duration` and `time_remaining` field to the `listbanned` RPC command. Thanks to jonatack, this PR also expands the `listbanned` test coverage to include these new fields

  It's useful to keep track of `ban_duration` as this is another data point on which to sort banned peers. I found this helpful in adding additional context columns to the GUI `bantablemodel` as part of a follow-up PR. As [suggested](https://github.com/bitcoin/bitcoin/pull/21602#issuecomment-813486134) by jonatack, `time_remaining` is another useful user-centric data point.

  Since a ban always expires after its created, the `ban_created` field is now placed before the `banned_until` field. This new ordering is more logical.

  This PR also improves the `help listbanned` output by providing additional context to the descriptions of the `address`, `ban_created`, and `banned_until` fields.

  **Master: listbanned**
  ```
  [
    {
      "address": "1.2.3.4/32",
      "banned_until": 1617691101,
      "ban_created": 1617604701
    },
    {
      "address": "135.181.41.129/32",
      "banned_until": 1649140716,
      "ban_created": 1617604716
    }
  ]
  ```

  **PR: listbanned**
  ```
  [
    {
      "address": "1.2.3.4/32",
      "ban_created": 1617775773,
      "banned_until": 1617862173,
      "ban_duration": 86400,
      "time_remaining": 86392
    },
    {
      "address": "3.114.211.172/32",
      "ban_created": 1617753165,
      "banned_until": 1618357965,
      "ban_duration": 604800,
      "time_remaining": 582184
    }
  ]
  ```

ACKs for top commit:
  jonatack:
    re-ACK d3b0b08b0f04d2f1dbebbafd7ab0384dfe045dec
  hebasto:
    ACK d3b0b08b0f04d2f1dbebbafd7ab0384dfe045dec, tested on Linux Mint 20.1 (x86_64).
  MarcoFalke:
    review ACK d3b0b08b0f04d2f1dbebbafd7ab0384dfe045dec 🕙

Tree-SHA512: 5b83ed2483344e546d57e43adc8a1ed7a1fff292124b14c86ca3a1aa2aec8b0f7198212fabff2c5145e7f726ca04ae567fe667b141254c7519df290cf63774e5

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