Rewrite Icon fetching (#3023)

* Rewrite Icon fetching

* Move validation to IconUri, Uri, or UriBuilder

* `dotnet format` 🤖

* PR suggestions

* Add not null compiler hint

* Add twitter to test case

* Move Uri manipulation to UriService

* Implement MockedHttpClient

Presents better, fluent handling of message matching and response
building.

* Add redirect handling tests

* Add testing to models

* More aggressively dispose content in icon link

* Format 🤖

* Update icon lockfile

* Convert to cloned stream for HttpResponseBuilder

Content was being disposed when HttResponseMessage was being disposed.
This avoids losing our reference to our content and allows multiple
usages of the same `MockedHttpMessageResponse`

* Move services to extension

Extension is shared by testing and allows access to services from
our service tests

* Remove unused `using`

* Prefer awaiting asyncs for better exception handling

* `dotnet format` 🤖

* Await async

* Update tests to use test TLD and ip ranges

* Remove unused interfaces

* Make assignments static when possible

* Prefer invariant comparer to downcasing

* Prefer injecting interface services to implementations

* Prefer comparer set in HashSet initialization

* Allow SVG icons

* Filter out icons with unknown formats

* Seek to beginning of MemoryStream after writing it

* More appropriate to not return icon if it's invalid

* Add svg icon test

test/Common/MockedHttpClient/MockedHttpResponse.cs

@@ -0,0 +1,68 @@
+using System.Net;
+using System.Net.Http.Headers;
+using System.Text;
+
+namespace Bit.Test.Common.MockedHttpClient;
+
+public class MockedHttpResponse : IMockedHttpResponse
+{
+    private MockedHttpResponse _childResponse;
+    private readonly Func<HttpRequestMessage, HttpResponseBuilder, HttpResponseBuilder> _responder;
+
+    public int NumberOfResponses { get; private set; }
+
+    public MockedHttpResponse(HttpStatusCode statusCode)
+    {
+        _responder = (_, builder) => builder.WithStatusCode(statusCode);
+    }
+
+    private MockedHttpResponse(Func<HttpRequestMessage, HttpResponseBuilder, HttpResponseBuilder> responder)
+    {
+        _responder = responder;
+    }
+
+    public MockedHttpResponse WithStatusCode(HttpStatusCode statusCode)
+    {
+        return AddChild((_, builder) => builder.WithStatusCode(statusCode));
+    }
+
+    public MockedHttpResponse WithHeader(string name, string value)
+    {
+        return AddChild((_, builder) => builder.WithHeader(name, value));
+    }
+    public MockedHttpResponse WithHeaders(params KeyValuePair<string, string>[] headers)
+    {
+        return AddChild((_, builder) => headers.Aggregate(builder, (b, header) => b.WithHeader(header.Key, header.Value)));
+    }
+
+    public MockedHttpResponse WithContent(string mediaType, string content)
+    {
+        return WithContent(new StringContent(content, Encoding.UTF8, mediaType));
+    }
+    public MockedHttpResponse WithContent(string mediaType, byte[] content)
+    {
+        return WithContent(new ByteArrayContent(content) { Headers = { ContentType = new MediaTypeHeaderValue(mediaType) } });
+    }
+    public MockedHttpResponse WithContent(HttpContent content)
+    {
+        return AddChild((_, builder) => builder.WithContent(content));
+    }
+
+    public async Task<HttpResponseMessage> RespondToAsync(HttpRequestMessage request)
+    {
+        return await RespondToAsync(request, new HttpResponseBuilder());
+    }
+
+    private async Task<HttpResponseMessage> RespondToAsync(HttpRequestMessage request, HttpResponseBuilder currentBuilder)
+    {
+        NumberOfResponses++;
+        var nextBuilder = _responder(request, currentBuilder);
+        return await (_childResponse == null ? nextBuilder.ToHttpResponseAsync() : _childResponse.RespondToAsync(request, nextBuilder));
+    }
+
+    private MockedHttpResponse AddChild(Func<HttpRequestMessage, HttpResponseBuilder, HttpResponseBuilder> responder)
+    {
+        _childResponse = new MockedHttpResponse(responder);
+        return _childResponse;
+    }
+}