Merge #20286: rpc: deprecate `addresses` and `reqSigs` from rpc outputs

90ae3d8ca68334ec712d67b21a8d4721c6d79788 doc: Add release notes for -deprecatedrpc=addresses and bitcoin-tx (Michael Dietz)
085b3a729952896ccd0e40c17df569f4421f5493 rpc: deprecate `addresses` and `reqSigs` from rpc outputs (Michael Dietz)

Pull request description:

  Considering the limited applicability of `reqSigs` and the confusing output of `1` in all cases except bare multisig, the `addresses` and `reqSigs` outputs are removed for all rpc commands.

  1) add a new sane "address" field (for outputs that have an identifiable address, which doesn't include bare multisig)
  2) with -deprecatedrpc: leave "reqSigs" and "addresses" intact (with all weird/wrong behavior they have now)
  3) without -deprecatedrpc: drop "reqSigs" and "addresses" entirely always.

  Note: Some light refactoring done to allow us to very easily delete a few chunks of code (marked with TODOs) when we remove this deprecated behavior.

  Using `IsDeprecatedRPCEnabled` in core_write.cpp caused some circular dependencies involving core_io

  Circular dependencies were caused by rpc/util unnecessarily importing node/coinstats and node/transaction. Really what rpc/util needs are some fundamental type/helper-function definitions. So this was cleaned up to make more sense.

  This fixes #20102.

ACKs for top commit:
  MarcoFalke:
    re-ACK 90ae3d8ca68334ec712d67b21a8d4721c6d79788 📢

Tree-SHA512: 8ffb617053b5f4a8b055da17c06711fd19632e0037d71c4c8135e50c8cd7a19163989484e4e0f17a6cc48bd597f04ecbfd609aef54b7d1d1e76a784214fcf72a

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