[wallet, rpc]: add max_tx_weight to tx funding options

This allows a transaction's weight to be bound under a certain
weight if possible and desired. This can be beneficial for future
RBF attempts, or whenever a more restricted spend topology is
desired.

Co-authored-by: Greg Sanders <gsanders87@gmail.com>

src/rpc/client.cpp

@@ -146,6 +146,7 @@ static const CRPCConvertParam vRPCConvertParams[] =
     { "fundrawtransaction", 1, "conf_target"},
     { "fundrawtransaction", 1, "replaceable"},
     { "fundrawtransaction", 1, "solving_data"},
+    { "fundrawtransaction", 1, "max_tx_weight"},
     { "fundrawtransaction", 2, "iswitness" },
     { "walletcreatefundedpsbt", 0, "inputs" },
     { "walletcreatefundedpsbt", 1, "outputs" },
@@ -164,6 +165,7 @@ static const CRPCConvertParam vRPCConvertParams[] =
     { "walletcreatefundedpsbt", 3, "conf_target"},
     { "walletcreatefundedpsbt", 3, "replaceable"},
     { "walletcreatefundedpsbt", 3, "solving_data"},
+    { "walletcreatefundedpsbt", 3, "max_tx_weight"},
     { "walletcreatefundedpsbt", 4, "bip32derivs" },
     { "walletprocesspsbt", 1, "sign" },
     { "walletprocesspsbt", 3, "bip32derivs" },
@@ -208,6 +210,7 @@ static const CRPCConvertParam vRPCConvertParams[] =
     { "send", 4, "conf_target"},
     { "send", 4, "replaceable"},
     { "send", 4, "solving_data"},
+    { "send", 4, "max_tx_weight"},
     { "sendall", 0, "recipients" },
     { "sendall", 1, "conf_target" },
     { "sendall", 3, "fee_rate"},