Merge #18772: rpc: calculate fees in getblock using BlockUndo data

66d012ad7f9381bacfc9b8388fa2ebf82cb86c9e test: RPC: getblock fee calculations (Elliott Jin)
bf7d6e31b1062ab5f90e14e83c56309f499fa2e9 RPC: getblock: tx fee calculation for verbosity 2 via Undo data (Elliott Jin)

Pull request description:

  This change is progress towards #18771 .  It adapts the fee calculation part of #16083 and addresses some feedback.  The additional "verbosity level 3" features are planned for a future PR.

  **Original PR description:**

  > Using block undo data (like in #14802) we can now show fee information for each transaction in a block without the need for additional -txindex and/or a ton of costly lookups. For a start we'll add transaction fee information to getblock verbosity level 2. This comes at a negligible speed penalty (<1%).

ACKs for top commit:
  luke-jr:
    tACK 66d012ad7f9381bacfc9b8388fa2ebf82cb86c9e
  fjahr:
    tACK 66d012ad7f9381bacfc9b8388fa2ebf82cb86c9e
  MarcoFalke:
    review ACK 66d012ad7f9381bacfc9b8388fa2ebf82cb86c9e 🗜

Tree-SHA512: be1fe4b866946a8dc36427f7dc72a20e10860e320a28fa49bc85bd2a93a0d699768179be29fa52e18b2ed8505d3ec272e586753ef2239b4230e0aefd233acaa2

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