[Bugfix] Communications (#7)

This PR contains the work done to implement some bugfixes to the existing source code related to the `Communications` library of this package.

To provide further details about the work done:
- [x] removed an unnecessary function from the `Client` public protocol;
- [x] moved the `MakeURLRequestError` public error to its own file;
- [x] added the `parameters` property to the `Endpoint` public protocol;
- [x] added support for the parameters handling in the `MakeURLRequestUseCase` use case.

Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Reviewed-on: #7

Sources/Communications/Errors/MakeURLRequestError.swift

@@ -0,0 +1,17 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the SwiftLibs open source project
+//
+// Copyright (c) 2023 Röck+Cöde VoF. and the SwiftLibs project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of SwiftLibs project authors
+//
+//===----------------------------------------------------------------------===//
+
+/// Errors generated out of the `MakeURLRequestUseCase` use case.
+public enum MakeURLRequestError: Error {
+    /// An expected URL was not created.
+    case urlNotCreated
+}