Merge #10973: Refactor: separate wallet from node

d358466de Remove remaining wallet accesses to node globals (Russell Yanofsky)
b1b2b2389 Remove use of CCoinsViewMemPool::GetCoin in wallet code (Russell Yanofsky)
4e4d9e9f8 Remove use of CRPCTable::appendCommand in wallet code (Russell Yanofsky)
91868e628 Remove use CValidationInterface in wallet code (Russell Yanofsky)

Pull request description:

  This PR is the last in a chain of PRs (#14437, #14711, and #15288) that make the wallet code access node state through an abstract [`Chain`](https://github.com/ryanofsky/bitcoin/blob/pr/wipc-sep/src/interfaces/chain.h) class in [`src/interfaces/`](https://github.com/ryanofsky/bitcoin/tree/pr/wipc-sep/src/interfaces) instead of using global variables like `cs_main`, `chainActive`, and `g_connman`. After this PR, wallet code no longer accesses global variables declared outside the wallet directory, and no longer calls functions accessing those globals (as verified by the `hide-globals` script in #10244).

  This PR and the previous PRs have been refactoring changes that do not affect behavior. Previous PRs have consisted of lots of mechanical changes like:

  ```diff
  -    wtx.nTimeReceived = GetAdjustedTime();
  +    wtx.nTimeReceived = m_chain->getAdjustedTime();
  ```

  This PR is smaller, but less mechanical. It replaces last few bits of wallet code that access node state directly (through `CValidationInterface`, `CRPCTable`, and `CCoinsViewMemPool` interfaces) with code that uses the `Chain` interface.

  These changes allow followup PR #10102 (multiprocess gui & wallet PR) to work without any significant updates to wallet code. Additionally they:

  * Provide a single place to describe the interface between wallet and node code.
  * Can make better wallet testing possible, because the `Chain` object consists of virtual methods that can be overloaded for mocking. (This could be used to test edge cases in the rescan code, for example).

Tree-SHA512: e6291d8a3c50bdff18a9c8ad11e729beb30b5b7040d7aaf31ba678800b4a97b2dd2be76340b1e5c01fe2827d67d37ed1bb4c8380cf8ed653aadfea003e9b22e7

src/test/rpc_tests.cpp

@@ -31,10 +31,9 @@ UniValue CallRPC(std::string args)
     request.strMethod = strMethod;
     request.params = RPCConvertValues(strMethod, vArgs);
     request.fHelp = false;
-    BOOST_CHECK(tableRPC[strMethod]);
-    rpcfn_type method = tableRPC[strMethod]->actor;
+    if (RPCIsInWarmup(nullptr)) SetRPCWarmupFinished();
     try {
-        UniValue result = (*method)(request);
+        UniValue result = tableRPC.execute(request);
         return result;
     }
     catch (const UniValue& objError) {