Merge bitcoin/bitcoin#24936: test: compare /mempool/contents response with getrawmempool RPC

bef6149 test: compare `/mempool/contents` response with `getrawmempool` RPC (brunoerg)
5bc5cba doc: add reference to `getrawmempool` RPC in `/mempool/contents` REST doc (brunoerg)

Pull request description:

  This PR is similar to #24797, it compares `/mempool/contents` REST response with `getrawmempool` RPC (verbose=True) since they use the same `MempoolToJSON` function.

  Also, adds a reference to `getrawmempool` RPC help to get details about the fields from `/mempool/contents`.

ACKs for top commit:
  0xB10C:
    ACK bef6149

Tree-SHA512: b7e9e9c765ee837986ba167b9234a9b95c9ef0a9ebcc2a03d50f6be6d3aba1480bd77c78111d95df1e4023cde6dfc64bf1e7908d9e5b6f96ca46b76611a4a9b4

Author: MarcoFalke

doc/REST-interface.md

@@ -125,6 +125,7 @@ Refer to the `getmempoolinfo` RPC help for details.
 
 Returns the transactions in the mempool.
 Only supports JSON as output format.
+Refer to the `getrawmempool` RPC help for details.
 
 Risks
 -------------

test/functional/interface_rest.py

@@ -326,6 +326,10 @@ def run_test(self):
 
         # Check that there are our submitted transactions in the TX memory pool
         json_obj = self.test_rest_request("/mempool/contents")
+        raw_mempool_verbose = self.nodes[0].getrawmempool(verbose=True)
+
+        assert_equal(json_obj, raw_mempool_verbose)
+
         for i, tx in enumerate(txs):
             assert tx in json_obj
             assert_equal(json_obj[tx]['spentby'], txs[i + 1:i + 2])