refactor: mempool: use CTxMempool::Limits

Simplifies function signatures by removing repetition of all the
ancestor/descendant limits,  and increases readability by being
more verbose by naming the limits, while still reducing the LoC.

src/node/interfaces.cpp

@@ -660,8 +660,7 @@ public:
         std::string unused_error_string;
         LOCK(m_node.mempool->cs);
         return m_node.mempool->CalculateMemPoolAncestors(
-            entry, ancestors, limits.ancestor_count, limits.ancestor_size_vbytes,
-            limits.descendant_count, limits.descendant_size_vbytes, unused_error_string);
+            entry, ancestors, limits, unused_error_string);
     }
     CFeeRate estimateSmartFee(int num_blocks, bool conservative, FeeCalculation* calc) override
     {