Ava Chow daca51bf80 Merge bitcoin/bitcoin#32750: refactor: CFeeRate encapsulates FeeFrac internally
d3b8a54a81 Refactor CFeeRate to use FeeFrac internally (Pol Espinasa)

Pull request description:

  The `FeeFrac` type represents a fraction, intended to be used for `sats/vbyte` or `sats/WU`. It was added to improve accuracy when evaluating fee rates in cluster mempool. [1]
  But it can also be used to fix the precision issues that the current `CFeeRate` class has now.

  At the moment, `CFeeRate` handles the fee rate as  satoshis per kilovirtualbyte: `CAmount / kvB` using an integer.
  This PR fix `CFeeRate` precision issues by encapsulating `FeeFrac` internally keeping backwards compatibility.

  This PR can also be used as a based to use multiple units on RPC calls as detailed in this issue [2].

  Some previous discussions:
  [1] https://github.com/bitcoin/bitcoin/pull/30535
  [2] https://github.com/bitcoin/bitcoin/issues/32093

ACKs for top commit:
  achow101:
    ACK d3b8a54a81
  murchandamus:
    code review, lightly tested ACK d3b8a54a81
  ismaelsadeeq:
    re-ACK d3b8a54a81 📦
  theStack:
    Code-review ACK d3b8a54a81

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Bitcoin Core integration/staging tree

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