refactor: Move functions to BlockManager methods

This is a commit in preparation for the next few commits. The functions
are moved to methods to avoid their re-declaration for the purpose of
passing in BlockManager options.

The functions that were now moved into the BlockManager should no longer
use the params as an argument, but instead use the member variable.

In the moved ReadBlockFromDisk and UndoReadFromDisk, change
the function signature to accept a reference to a CBlockIndex instead of
a raw pointer. The pointer is expected to be non-null, so reflect that
in the type.

To allow for the move of functions to BlockManager methods all call
sites require an instantiated BlockManager, or a callback to one.

src/node/transaction.h

@@ -16,6 +16,7 @@ struct Params;
 }
 
 namespace node {
+class BlockManager;
 struct NodeContext;
 
 /** Maximum fee rate for sendrawtransaction and testmempoolaccept RPC calls.
@@ -53,11 +54,10 @@ static const CFeeRate DEFAULT_MAX_RAW_TX_FEE_RATE{COIN / 10};
  * @param[in]  block_index     The block to read from disk, or nullptr
  * @param[in]  mempool         If provided, check mempool for tx
  * @param[in]  hash            The txid
- * @param[in]  consensusParams The params
  * @param[out] hashBlock       The block hash, if the tx was found via -txindex or block_index
  * @returns                    The tx if found, otherwise nullptr
  */
-CTransactionRef GetTransaction(const CBlockIndex* const block_index, const CTxMemPool* const mempool, const uint256& hash, const Consensus::Params& consensusParams, uint256& hashBlock);
+CTransactionRef GetTransaction(const CBlockIndex* const block_index, const CTxMemPool* const mempool, const uint256& hash, uint256& hashBlock, const BlockManager& blockman);
 } // namespace node
 
 #endif // BITCOIN_NODE_TRANSACTION_H