Merge bitcoin/bitcoin#28385: [refactor] rewrite DisconnectedBlockTransactions to not use boost

4313c77400 make DisconnectedBlockTransactions responsible for its own memory management (glozow)
cf5f1faa03 MOVEONLY: DisconnectedBlockTransactions to its own file (glozow)
2765d6f343 rewrite DisconnectedBlockTransactions as a list + map (glozow)
79ce9f0aa4 add std::list to memusage (glozow)
59a35a7398 [bench] DisconnectedBlockTransactions (glozow)
925bb723ca [refactor] batch-add transactions to DisconnectedBlockTransactions (glozow)

Pull request description:

  Motivation
  - I think it's preferable to use stdlib data structures instead of depending on boost if we can achieve the same thing.
  - Also see #28335 for further context/motivation. This PR simplifies that one.

  Things done in this PR:
  - Add a bench for `DisconnectedBlockTransactions` where we reorg and the new chain has {100%, 90%, 10%} of the same transactions. AFAIU in practice, it's usually close to 100%.
  - Rewrite `DisconnectedBlockTransactions` as a `std::list` + `unordered_map` instead of a boost multi index container.
    - On my machine, the bench suggests the performance is very similar.
  - Move `DisconnectedBlockTransactions` from txmempool.h to its own kernel/disconnected_transactions.h. This struct isn't used by txmempool and doesn't have much to do with txmempool. My guess is that it's been living there for convenience since the boost includes are there.

ACKs for top commit:
  ismaelsadeeq:
    Tested ACK 4313c77400
  stickies-v:
    ACK 4313c77400
  TheCharlatan:
    ACK 4313c77400

Tree-SHA512: 273c80866bf3acd39b2a039dc082b7719d2d82e0940e1eb6c402f1c0992e997256722b85c7e310c9811238a770cfbdeb122ea4babbc23835d17128f214a1ef9e

src/validation.h

@@ -50,7 +50,7 @@ class Chainstate;
 class CTxMemPool;
 class ChainstateManager;
 struct ChainTxData;
-struct DisconnectedBlockTransactions;
+class DisconnectedBlockTransactions;
 struct PrecomputedTransactionData;
 struct LockPoints;
 struct AssumeutxoData;