Merge #15644: Make orphan processing interruptible

866c8058a7 Interrupt orphan processing after every transaction (Pieter Wuille)
6e051f3d32 [MOVEONLY] Move processing of orphan queue to ProcessOrphanTx (Pieter Wuille)
9453018fdc Simplify orphan processing in preparation for interruptibility (Pieter Wuille)

Pull request description:

  As individual orphan transactions can be relatively expensive to handle, it's undesirable to process all of them (max 100) as soon as the parent becomes available, as it pegs the net processing the whole time.

  Change this by interrupting orphan handling after every transactions, and continue in the next processing slot of the peer that gave us the parent - similar to how getdata processing works now. Messages from other peers arriving in the mean time are processed normally, but other messages from the peer that gave us the parent have to wait until all orphan processing is done.

ACKs for commit 866c80:
  sdaftuar:
    ACK 866c8058a706931f025335b3e794ed2f4d287918
  MarcoFalke:
    utACK 866c8058a706931f025335b3e794ed2f4d287918
  promag:
    utACK 866c805. Verified refactor in 9453018fdc8f02d42832374bcf1d6e3a1df02281 and moved code in 6e051f3d323af1d209c02e7a4319834f1947ffa7. Not so sure about change in 866c8058a706931f025335b3e794ed2f4d287918 just because I'm not familiar with net processing.

Tree-SHA512: d8e8a1ee5f2999446cdeb8fc9756ed9c24f3d5cd769a7774ec4c317fc8d463fdfceec88de97266f389b715a5dfcc2b0a3abaa573955ea451786cc43b870e8cde

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