Merge #16129: refactor: Remove unused includes

67f4e9c522 Include core_io.h from core_read.cpp (practicalswift)
eca9767673 Make reasoning about dependencies easier by not including unused dependencies (practicalswift)

Pull request description:

  Make reasoning about dependencies easier by not including unused dependencies.

  Please note that the removed headers are _not_ "transitively included" by other still included headers. Thus the removals are real.

  As an added bonus this change means less work for the preprocessor/compiler. At least 51 393 lines of code no longer needs to be processed:

  ```
  $ git diff -u HEAD~1 | grep -E '^\-#include ' | cut -f2 -d"<" | cut -f1 -d">" | \
        sed 's%^%src/%g' | xargs cat | wc -l
  51393
  ```

  Note that 51 393 is the lower bound: the real number is likely much higher when taking into account transitively included headers :-)

ACKs for commit 67f4e9:

Tree-SHA512: 0c8868aac59813f099ce53d5307eed7962dd6f2ff3546768ef9e5c4508b87f8210f1a22c7e826c3c06bebbf28bdbfcf1628ed354c2d0fdb9a31a42cefb8fdf13

src/interfaces/node.cpp

@@ -23,7 +23,6 @@
 #include <policy/settings.h>
 #include <primitives/block.h>
 #include <rpc/server.h>
-#include <scheduler.h>
 #include <shutdown.h>
 #include <sync.h>
 #include <txmempool.h>

src/interfaces/wallet.cpp

@@ -5,27 +5,19 @@
 #include <interfaces/wallet.h>
 
 #include <amount.h>
-#include <chain.h>
 #include <consensus/validation.h>
-#include <init.h>
 #include <interfaces/chain.h>
 #include <interfaces/handler.h>
-#include <net.h>
 #include <policy/feerate.h>
 #include <policy/fees.h>
-#include <policy/policy.h>
 #include <primitives/transaction.h>
-#include <rpc/server.h>
-#include <scheduler.h>
 #include <script/ismine.h>
 #include <script/standard.h>
 #include <support/allocators/secure.h>
 #include <sync.h>
-#include <timedata.h>
 #include <ui_interface.h>
 #include <uint256.h>
 #include <util/system.h>
-#include <validation.h>
 #include <wallet/feebumper.h>
 #include <wallet/fees.h>
 #include <wallet/rpcwallet.h>