fix: added default initializer for EthereumParameters;

Sources/web3swift/Transaction/EthereumParameters.swift

@@ -49,6 +49,30 @@ public struct EthereumParameters {
 
     /// access list for contract execution (EIP-2930 and EIP-1559 only)
     public var accessList: [AccessListEntry]?
+
+    public init(type: TransactionType? = nil,
+                to: EthereumAddress? = nil,
+                nonce: BigUInt? = nil,
+                chainID: BigUInt? = nil,
+                value: BigUInt? = nil,
+                data: Data? = nil,
+                gasLimit: BigUInt? = nil,
+                gasPrice: BigUInt? = nil,
+                maxFeePerGas: BigUInt? = nil,
+                maxPriorityFeePerGas: BigUInt? = nil,
+                accessList: [AccessListEntry]? = nil) {
+        self.type = type
+        self.to = to
+        self.nonce = nonce
+        self.chainID = chainID
+        self.value = value
+        self.data = data
+        self.gasLimit = gasLimit
+        self.gasPrice = gasPrice
+        self.maxFeePerGas = maxFeePerGas
+        self.maxPriorityFeePerGas = maxPriorityFeePerGas
+        self.accessList = accessList
+    }
 }
 
 public extension EthereumParameters {