Merge #16839: Replace Connman and BanMan globals with NodeContext local

362ded410b8cb1104b7ef31ff8488fec4824a7d5 Avoid using g_rpc_node global in wallet code (Russell Yanofsky)
8922d7f6b751a3e6b3b9f6fb7961c442877fb65a scripted-diff: Remove g_connman, g_banman globals (Russell Yanofsky)
e6f4f895d5e42feaf7bfa5f41e80292aaa73cd7d Pass NodeContext, ConnMan, BanMan references more places (Russell Yanofsky)
4d5448c76b71c9d91399c31b043237091be2e5e7 MOVEONLY: Move NodeContext struct to node/context.h (Russell Yanofsky)
301bd41a2e6765b185bd55f4c541f9e27aeea29d scripted-diff: Rename InitInterfaces to NodeContext (Russell Yanofsky)

Pull request description:

  This change is mainly a naming / organization change intended to simplify #10102. It:

  - Renames struct InitInterfaces to struct NodeContext and moves it from
    src/init.h to src/node/context.h. This is a cosmetic change intended to make
    the point of the struct more obvious.

  - Gets rid of BanMan and ConnMan globals making them NodeContext members
    instead. Getting rid of these globals has been talked about in past as a way
    to implement testing and simulations. Making them NodeContext members is a
    way of keeping them accessible without the globals.

  - Splits g_rpc_interfaces global into g_rpc_node and g_rpc_chain globals. This
    better separates node and wallet rpc methods. Node RPC methods should have
    access NodeContext, while wallet RPC methods should only have indirect access
    to node functionality via interfaces::Chain.

  - Adds NodeContext& references to interfaces::Chain class and the
    interfaces::MakeChain() function. This is needed to access ConnMan and BanMan
    instances without the globals.

  - Gets rid of redundant Node and Chain instances in Qt tests. This is
    needed due to the previous MakeChain change, and also makes test setup a
    little more straightforward. More cleanup could be done in the future, but it
    will require deduplication of bitcoind, bitcoin-qt, and TestingSetup init
    code.

ACKs for top commit:
  laanwj:
    ACK 362ded410b8cb1104b7ef31ff8488fec4824a7d5

Tree-SHA512: 9ae6ff1e33423291d1e52056bac95e0874538390892a6e83c4c115b3c73155a8827c0191b46eb3d14e3b3f6c23ccb08095490880fbc3188026319c71739f7db2

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