fix: added initializer for the Web3EthMock

Author: JeneaVranceanu

Tests/web3swiftTests/localTests/Mocks.swift

@@ -9,8 +9,14 @@ import Foundation
 @testable import Core
 
 class Web3EthMock: IEth {
+    let provider: Web3Provider
+
     var onCallTransaction: ((CodableTransaction) -> Data)?
 
+    init(provider: Web3Provider) {
+        self.provider = provider
+    }
+
     func callTransaction(_ transaction: CodableTransaction) async throws -> Data {
         onCallTransaction?(transaction) ?? Data()
     }