[wallet] Remove package limit config access from wallet

The wallet should not be able to directly access global configuration
from the node. Remove access of "-limitancestorcount" and
"-limitdescendantcount".

src/interfaces/chain.h

@@ -163,6 +163,11 @@ public:
     //! Calculate mempool ancestor and descendant counts for the given transaction.
     virtual void getTransactionAncestry(const uint256& txid, size_t& ancestors, size_t& descendants) = 0;
 
+    //! Get the node's package limits.
+    //! Currently only returns the ancestor and descendant count limits, but could be enhanced to
+    //! return more policy settings.
+    virtual void getPackageLimits(unsigned int& limit_ancestor_count, unsigned int& limit_descendant_count) = 0;
+
     //! Check if transaction will pass the mempool's chain limits.
     virtual bool checkChainLimits(const CTransactionRef& tx) = 0;