Move Wasmtime for .NET to the Wasmtime repo.

This moves the Wasmtime for .NET implementation to the Wasmtime repo.

Wasmtime for .NET is a binding of the Wasmtime API for use in .NET.

crates/misc/dotnet/tests/MemoryImportNoUpperBoundTests.cs

@@ -0,0 +1,34 @@
+using System;
+using FluentAssertions;
+using Xunit;
+
+namespace Wasmtime.Tests
+{
+    public class MemoryImportNoUpperBoundFixture : ModuleFixture
+    {
+        protected override string ModuleFileName => "MemoryImportNoUpperBound.wasm";
+    }
+
+    public class MemoryImportNoUpperBoundTests : IClassFixture<MemoryImportNoUpperBoundFixture>
+    {
+        public MemoryImportNoUpperBoundTests(MemoryImportNoUpperBoundFixture fixture)
+        {
+            Fixture = fixture;
+        }
+
+        private MemoryImportNoUpperBoundFixture Fixture { get; set; }
+
+        [Fact]
+        public void ItHasTheExpectedImport()
+        {
+            Fixture.Module.Imports.Memories.Count.Should().Be(1);
+
+            var memory = Fixture.Module.Imports.Memories[0];
+
+            memory.ModuleName.Should().Be("");
+            memory.Name.Should().Be("mem");
+            memory.Minimum.Should().Be(1);
+            memory.Maximum.Should().Be(uint.MaxValue);
+        }
+    }
+}