[Library] Feed library (#4)

This PR contains the work done to setup the library and also, the necessary protocols, model, structs, and error definitions to implement remote service clients.

Reviewed-on: rock-n-code/app-reviews#4
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

Libraries/Feed/Kit/Sources/Protocols/Endpoint.swift

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+//
+//  Endpoint.swift
+//  ReviewsFeedKit
+//
+//  Created by Javier Cicchelli on 17/03/2024.
+//  Copyright © 2024 Röck+Cöde VoF. All rights reserved.
+//
+
+import Foundation
+
+public protocol Endpoint {
+    
+    // MARK: Associated types
+    associatedtype Input: EndpointInput
+    associatedtype Output: EndpointOutput
+    
+    // MARK: Properties
+    var host: URL { get }
+    var decoder: JSONDecoder { get }
+    var session: URLSession { get }
+    
+    // MARK: Functions
+    func callAsFunction(_ input: Input) async throws -> Output
+    func makePath(with input: Input) throws -> String
+    
+}
+
+// MARK: - Input
+public protocol EndpointInput {}
+
+// MARK: - Output
+public protocol EndpointOutput {}

Libraries/Feed/Kit/Sources/Protocols/Endpoints/GetReviewsEndpoint.swift

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+//
+//  GetReviewsEndpoint.swift
+//  ReviewsFeedKit
+//
+//  Created by Javier Cicchelli on 17/03/2024.
+//  Copyright © 2024 Röck+Cöde VoF. All rights reserved.
+//
+
+import Foundation
+
+public protocol GetReviewsEndpoint: Endpoint
+where Input == GetReviewsInput,
+      Output == GetReviewsOutput {}
+
+// MARK: - Input
+public struct GetReviewsInput: EndpointInput {
+    
+    // MARK: Constants
+    public let appID: String
+    public let countryCode: String
+    
+    // MARK: Initialisers
+    public init(
+        appID: String,
+        countryCode: String
+    ) {
+        self.appID = appID
+        self.countryCode = countryCode
+    }
+    
+}
+
+// MARK: - Output
+public struct GetReviewsOutput: EndpointOutput {
+    
+    // MARK: Constants
+    public let reviews: [Review]
+    
+    // MARK: Initialisers
+    public init(reviews: [Review]) {
+        self.reviews = reviews
+    }
+    
+}

Libraries/Feed/Kit/Sources/Protocols/Service.swift

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+//
+//  Service.swift
+//  ReviewsFeedKit
+//
+//  Created by Javier Cicchelli on 17/03/2024.
+//  Copyright © 2024 Röck+Cöde VoF. All rights reserved.
+//
+
+import Foundation
+
+public protocol Service {
+
+    // MARK: Properties
+    var configuration: ServiceConfiguration { get }
+    var decoder: JSONDecoder { get }
+    var session: URLSession { get }
+
+    // MARK: Functions
+    func getReviews(_ input: GetReviewsInput) async throws -> GetReviewsOutput
+    
+}