Implement BIP 340-342 validation (Schnorr/taproot/tapscript)

[Bushstar]

Summary

• Implements the following upstream PRs from Bitcoin
  • https://github.com/bitcoin/bitcoin/pull/13204
  • https://github.com/bitcoin/bitcoin/pull/19601
  • https://github.com/bitcoin/bitcoin/pull/18002
  • https://github.com/bitcoin/bitcoin/pull/18422
  • https://github.com/bitcoin/bitcoin/pull/18388
  • https://github.com/bitcoin/bitcoin/pull/18468
  • https://github.com/bitcoin/bitcoin/pull/18401
  • https://github.com/bitcoin/bitcoin/pull/20006
  • https://github.com/bitcoin/bitcoin/pull/19953
  • https://github.com/bitcoin/bitcoin/pull/21081

Implications

• Storage

  • [ ] Database reindex required
  • [ ] Database reindex optional
  • [ ] Database reindex not required
  • [x] None

• Consensus

  • [x] Network upgrade required
  • [ ] Includes backward compatible changes
  • [ ] Includes consensus workarounds
  • [ ] Includes consensus refactors
  • [ ] None