Port send jslib to mobile (#1219)

* Expand Hkdf crypto functions

* Add tests for hkdf crypto functions

Took the testing infrastructure from bitwarden/server

* Move Hkdf to cryptoFunctionService

* Port changes from bitwarden/jslib#192

* Port changes from bitwarden/jslib#205

* Make Send Expiration Optional implement changes from bitwarden/jslib#242

* Bug fixes found by testing

* Test helpers

* Test conversion between model types

* Test SendService

These are mostly happy-path tests to ensure a reasonably correct
implementation

* Add run tests step to GitHub Actions

* Test send decryption

* Test Request generation from Send

* Constructor dependencies on separate lines

* Remove unused testing infrastructure

* Rename to match class name

* Move fat arrows to previous lines

* Handle exceptions in App layer

* PR review cleanups

* Throw when attempting to save an unkown Send Type

I think it's best to only throw on unknown send types here.
I don't think we want to throw whenever we encounter one since that would
do bad things like lock up Sync if clients get out of date relative to
servers. Instead, keep the client from ruining saved data by complaining
last minute that it doesn't know what it's doing.

src/Core/Models/Data/SendData.cs

@@ -0,0 +1,58 @@
+using System;
+using Bit.Core.Enums;
+using Bit.Core.Models.Response;
+
+namespace Bit.Core.Models.Data
+{
+    public class SendData : Data
+    {
+        public SendData() { }
+
+        public SendData(SendResponse response, string userId)
+        {
+            Id = response.Id;
+            AccessId = response.AccessId;
+            UserId = userId;
+            Type = response.Type;
+            Name = response.Name;
+            Notes = response.Notes;
+            Key = response.Key;
+            MaxAccessCount = response.MaxAccessCount;
+            AccessCount = response.AccessCount;
+            RevisionDate = response.RevisionDate;
+            ExpirationDate = response.ExpirationDate;
+            DeletionDate = response.DeletionDate;
+            Password = response.Password;
+            Disabled = response.Disabled;
+
+            switch (Type)
+            {
+                case SendType.File:
+                    File = new SendFileData(response.File);
+                    break;
+                case SendType.Text:
+                    Text = new SendTextData(response.Text);
+                    break;
+                default:
+                    break;
+            }
+        }
+        
+        public string Id { get; set; }
+        public string AccessId { get; set; }
+        public string UserId { get; set; }
+        public SendType Type { get; set; }
+        public string Name { get; set; }
+        public string Notes { get; set; }
+        public SendFileData File { get; set; }
+        public SendTextData Text { get; set; }
+        public string Key { get; set; }
+        public int? MaxAccessCount { get; set; }
+        public int AccessCount { get; set; }
+        public DateTime RevisionDate { get; set; }
+        public DateTime? ExpirationDate { get; set; }
+        public DateTime DeletionDate { get; set; }
+        public string Password { get; set; }
+        public bool Disabled { get; set; }
+    }
+}

src/Core/Models/Data/SendFileData.cs

@@ -0,0 +1,27 @@
+using System.Drawing;
+using Bit.Core.Models.Api;
+
+namespace Bit.Core.Models.Data
+{
+    public class SendFileData : Data
+    {
+        public SendFileData() { }
+
+        public SendFileData(SendFileApi data)
+        {
+            Id = data.Id;
+            Url = data.Url;
+            FileName = data.FileName;
+            Key = data.Key;
+            Size = data.Size;
+            SizeName = data.SizeName;
+        }
+
+        public string Id { get; set; }
+        public string Url { get; set; }
+        public string FileName { get; set; }
+        public string Key { get; set; }
+        public string Size { get; set; }
+        public string SizeName { get; set; }
+    }
+}

src/Core/Models/Data/SendTextData.cs

@@ -0,0 +1,19 @@
+using System.Drawing;
+using Bit.Core.Models.Api;
+
+namespace Bit.Core.Models.Data
+{
+    public class SendTextData : Data
+    {
+        public SendTextData() { }
+
+        public SendTextData(SendTextApi data)
+        {
+            Text = data.Text;
+            Hidden = data.Hidden;
+        }
+
+        public string Text { get; set; }
+        public bool Hidden { get; set; }
+    }
+}