Add Encoding capabilities

[mdb1]

• Add the extension to Encodable to transform an object to a dictionary.

public extension Encodable {
    /// Creates a json dictionary from an Encodable Object
    var toJsonDictionary: [String: Any] {
        let jsonEncoder: JSONEncoder = .default
        guard let data = try? jsonEncoder.encode(self) else { return [:] }
        let dictionary = try? JSONSerialization.jsonObject(with: data, options: []) as? [String: Any]
        return dictionary ?? [:]
    }
}

• Add the JSONEncoder to the HTTPClient and a convenient way to use Encodable models for post/put requests' bodies