#2401 Add new TFM's so package dependency can be removed (#2402)

Co-authored-by: James Newton-King <james@newtonking.com>

Author: thompson-tomo

src/Grpc.HealthCheck/Grpc.HealthCheck.csproj

@@ -5,7 +5,7 @@
 
     <IsGrpcPublishedPackage>true</IsGrpcPublishedPackage>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
-    <TargetFrameworks>net462;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>net462;netstandard2.0;net6.0;net7.0;net8.0</TargetFrameworks>
     <PackageReadmeFile>README.md</PackageReadmeFile>
   </PropertyGroup>
 
@@ -19,9 +19,13 @@
 
   <ItemGroup>
     <PackageReference Include="Google.Protobuf" />
-    <PackageReference Include="System.Threading.Channels" />
+    <PackageReference Include="Grpc.Tools" PrivateAssets="All" />
+
+    <Protobuf Include="health.proto" GrpcServices="Both" />
+  </ItemGroup>
 
-    <!-- TODO(jtattermusch): add reference to Grpc.Tools and use it for generating the Health.cs and HealthGrpc.cs sources -->
+  <ItemGroup Condition=" '$(TargetFramework)' == 'net462' or '$(TargetFramework)' == 'netstandard2.0'">
+    <PackageReference Include="System.Threading.Channels" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'net462' ">