Merge #16421: Conservatively accept RBF bumps bumping one tx at the package limits

5ce822efbe45513ce3517c1ca731ac6d6a0c3b54 Conservatively accept RBF bumps bumping one tx at the package limits (Matt Corallo)

Pull request description:

  Based on #15681, this adds support for some simple cases of RBF inside of large packages. Issue pointed out by sdaftuar in #15681, and this fix (or a broader one) is required ot make #15681 fully useful.

  Accept RBF bumps of single transactions (ie which evict exactly one
  transaction) even when that transaction is a member of a package
  which is currently at the package limit iff the new transaction
  does not add any additional mempool dependencies from the original.

  This could be made a bit looser in the future and still be safe,
  but for now this fixes the case that a transaction which was
  accepted by the carve-out rule will not be directly RBF'able

ACKs for top commit:
  instagibbs:
    re-ACK https://github.com/bitcoin/bitcoin/pull/16421/commits/5ce822efbe45513ce3517c1ca731ac6d6a0c3b54
  ajtowns:
    ACK 5ce822efbe45513ce3517c1ca731ac6d6a0c3b54 ; GetSizeWithDescendants is only change and makes sense
  sipa:
    Code review ACK 5ce822efbe45513ce3517c1ca731ac6d6a0c3b54. I haven't thought hard about the effect on potential DoS issues this policy change may have.

Tree-SHA512: 1cee3bc57393940a30206679eb60c3ec8cb4f4825d27d40d1f062c86bd22542dd5944fa5567601c74c8d9fd425333ed3e686195170925cfc68777e861844bd55

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