Merge bitcoin/bitcoin#23497: Add `src/node/` and `src/wallet/` code to `node::` and `wallet::` namespaces

e5b6aef61221b621ad77b5f075a16897e08835bf Move CBlockFileInfo::ToString method where class is declared (Russell Yanofsky)
f7086fd8ff084ab0dd656d75b7485e59263bdfd8 Add src/wallet/* code to wallet:: namespace (Russell Yanofsky)
90fc8b089d591cabff60ee829a33f96c37fd27ba Add src/node/* code to node:: namespace (Russell Yanofsky)

Pull request description:

  There are no code changes, this is just adding `namespace` and `using` declarations and `node::` or `wallet::` qualifiers in some places.

  Motivations for this change are:

  - To make it easier to see when node and wallet code is being accessed places where it shouldn't be. For example if GUI code is accessing node and wallet internals or if wallet and node code are referencing each other.
  - To make source code organization clearer ([#15732](https://github.com/bitcoin/bitcoin/issues/15732)), being able to know that `wallet::` code is in `src/wallet/`, `node::` code is in `src/node/`, `init::` code is in `src/init/`, `util::` code is in `src/util/`, etc.

  Reviewing with `git log -p -n1 -U0 --word-diff-regex=.` can be helpful to verify this is only updating declarations, not changing code.

ACKs for top commit:
  achow101:
    ACK e5b6aef61221b621ad77b5f075a16897e08835bf
  MarcoFalke:
    Concept ACK e5b6aef61221b621ad77b5f075a16897e08835bf 🍨

Tree-SHA512: 3797745c90246794e2d55a2ee6e8b0ad5c811e4e03a242d3fdfeb68032f8787f0d48ed4097f6b7730f540220c0af99ef423cd9dbe7f76b2ec12e769a757a2c8d

0 files changed, 0 insertions, 0 deletions