Update the call create 'from' param to be endpoint type for client identifier support (#480)

Author: childish-sambino

src/Twilio/Rest/Api/V2010/Account/CallOptions.cs

@@ -29,7 +29,7 @@ public class CreateCallOptions : IOptions<CallResource>
         /// <summary>
         /// Twilio number from which to originate the call
         /// </summary>
-        public Types.PhoneNumber From { get; }
+        public IEndpoint From { get; }
         /// <summary>
         /// The absolute URL that returns TwiML for this call
         /// </summary>
@@ -132,7 +132,7 @@ public class CreateCallOptions : IOptions<CallResource>
         /// </summary>
         /// <param name="to"> Phone number, SIP address, or client identifier to call </param>
         /// <param name="from"> Twilio number from which to originate the call </param>
-        public CreateCallOptions(IEndpoint to, Types.PhoneNumber from)
+        public CreateCallOptions(IEndpoint to, IEndpoint from)
         {
             To = to;
             From = from;

src/Twilio/Rest/Api/V2010/Account/CallResource.cs

@@ -146,7 +146,7 @@ public static async System.Threading.Tasks.Task<CallResource> CreateAsync(Create
         /// <param name="client"> Client to make requests to Twilio </param>
         /// <returns> A single instance of Call </returns>
         public static CallResource Create(IEndpoint to,
-                                          Types.PhoneNumber from,
+                                          IEndpoint from,
                                           string pathAccountSid = null,
                                           Uri url = null,
                                           string applicationSid = null,
@@ -217,7 +217,7 @@ public static CallResource Create(IEndpoint to,
         /// <param name="client"> Client to make requests to Twilio </param>
         /// <returns> Task that resolves to A single instance of Call </returns>
         public static async System.Threading.Tasks.Task<CallResource> CreateAsync(IEndpoint to,
-                                                                                  Types.PhoneNumber from,
+                                                                                  IEndpoint from,
                                                                                   string pathAccountSid = null,
                                                                                   Uri url = null,
                                                                                   string applicationSid = null,