rpc: Add transaction min standard version parameter

src/policy/policy.cpp

@@ -98,7 +98,7 @@ bool IsStandard(const CScript& scriptPubKey, TxoutType& whichType)
 
 bool IsStandardTx(const CTransaction& tx, const std::optional<unsigned>& max_datacarrier_bytes, bool permit_bare_multisig, const CFeeRate& dust_relay_fee, std::string& reason)
 {
-    if (tx.version > TX_MAX_STANDARD_VERSION || tx.version < 1) {
+    if (tx.version > TX_MAX_STANDARD_VERSION || tx.version < TX_MIN_STANDARD_VERSION) {
         reason = "version";
         return false;
     }

src/policy/policy.h

@@ -145,6 +145,7 @@ std::vector<uint32_t> GetDust(const CTransaction& tx, CFeeRate dust_relay_rate);
 // Changing the default transaction version requires a two step process: first
 // adapting relay policy by bumping TX_MAX_STANDARD_VERSION, and then later
 // allowing the new transaction version in the wallet/RPC.
+static constexpr decltype(CTransaction::version) TX_MIN_STANDARD_VERSION{1};
 static constexpr decltype(CTransaction::version) TX_MAX_STANDARD_VERSION{3};
 
 /**