Merge bitcoin/bitcoin#21732: MOVEONLY: Move common init code to init/common

615965cfd1 Move common package version code to init/common (Russell Yanofsky)
5bed2ab42c Move common logging start code to init/common (Russell Yanofsky)
1fb7fcfa52 Move common logging GetArgs code to init/common (Russell Yanofsky)
90469c1690 Move common logging AddArg code to init/common (Russell Yanofsky)
387c4cf588 Move common sanity check code to init/common (Russell Yanofsky)
a67b54855b Move common global init code to init/common (Russell Yanofsky)

Pull request description:

  This PR is part of the [process separation project](https://github.com/bitcoin/bitcoin/projects/10).

  ---

  This change is move-only and can be easily reviewed with `--color-moved=dimmed_zebra`. The moves are needed to avoid duplicating common init code between different binaries (`bitcoin-node`, `bitcoin-wallet`, etc) in #10102. In #10102, each binary has it's own init file (`src/init/bitcoin-node.cpp`, `src/init/bitcoin-wallet.cpp`) so this PR moves the common code to `src/init/common.cpp`.

ACKs for top commit:
  MarcoFalke:
    review ACK 615965cfd1 🖱
  practicalswift:
    cr ACK 615965cfd1: dimmed zebra looks correct

Tree-SHA512: 859e1d86aee17eb50a49d806cf62d30d12f6b15018e41c096da41d7e535a9d2d088481cb340fee59e6c68e512a74b61c7146f2683465f553dc4953bf32f2a7b4

src/Makefile.am

@@ -156,6 +156,7 @@ BITCOIN_CORE_H = \
   index/txindex.h \
   indirectmap.h \
   init.h \
+  init/common.h \
   interfaces/chain.h \
   interfaces/handler.h \
   interfaces/node.h \
@@ -521,6 +522,7 @@ libbitcoin_common_a_SOURCES = \
   core_read.cpp \
   core_write.cpp \
   external_signer.cpp \
+  init/common.cpp \
   key.cpp \
   key_io.cpp \
   merkleblock.cpp \