Add Sentry.Tunnel to add official tunnel middleware

[kanadaj]

Visual Studio is nagging me about Naming rule violation: Missing suffix: 'Async' on the tests, no clue why. It works otherwise.

#skip-changelog.

[bruno-garcia]

Thanks a lot for this again. THere are some small things before we can merge, could you please take a look?

Also, we could just target netcoreapp3.1 and not bother with 2.1 which is about to run out of support and this is anyway a new feature so requiring 3.1 isn't anything crazy.

[bruno-garcia]

What about just netcoreapp3.1 and netstandard2.0?

Suggested change

	<TargetFrameworks>net5.0;netcoreapp3.0;netstandard2.0</TargetFrameworks>
	<TargetFrameworks>netcoreapp3.1;netstandard2.0</TargetFrameworks>

[kanadaj]

Never bothered with 2.1, only 3.0, not sure if there is a point to do 3.1 instead. I added net5.0 just to ensure we have a version that binds against ASP.NET Core 5, just in case. Not sure if we need it but gotta make sure it doesn't pull in weird, old dependencies.

[bruno-garcia]

In case you take the change for the library:

Suggested change

	<TargetFrameworks>net5.0;netcoreapp3.1;netcoreapp2.1</TargetFrameworks>
	<TargetFrameworks>netcoreapp3.1;netcoreapp2.1</TargetFrameworks>

[bruno-garcia]

I believe this is declared on the parent folder's Directory.Build.props

Suggested change

	<ItemGroup>
	<PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
	<PackageReference Include="coverlet.collector" Version="3.0.2">
	<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
	<PrivateAssets>all</PrivateAssets>
	</PackageReference>
	</ItemGroup>

[kanadaj]

These are needed because the test project doesn't inherit Sentry.Testing, and if I inherit from that it fails to build...

[bruno-garcia]

I think we don't need any of this?

Suggested change

	<!-- Run netcoreapp3.0 against netstandard2.1 target of Sentry -->
	<ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.0'">
	<ProjectReference Update="../../src/Sentry/Sentry.csproj" SetTargetFramework="TargetFramework=netstandard2.1" />
	<!-- NET Core's built-in STJ is lower version which causes conflicts, so we have to explicitly reference it -->
	<PackageReference Include="System.Text.Json" Version="5.0.2" />
	<!-- Ben.Demystifier uses S.R.M v5 and also requires it via package reference when on nca3.x -->
	<PackageReference Include="System.Reflection.Metadata" Version="5.0.0" />
	</ItemGroup>
	<ItemGroup Condition="$(TargetFramework) == 'netcoreapp2.1' OR $(TargetFramework) == 'net461'">
	<PackageReference Include="Microsoft.AspNetCore.TestHost" Version="2.1.1" />
	</ItemGroup>
	<ItemGroup Condition="$(TargetFramework) == 'netcoreapp3.1'">
	<PackageReference Include="Microsoft.AspNetCore.TestHost" Version="3.1.0" />
	</ItemGroup>
	<ItemGroup Condition="$(TargetFramework) == 'net5.0'">
	<PackageReference Include="Microsoft.AspNetCore.TestHost" Version="5.0.0" />
	</ItemGroup>

[kanadaj]

We need it because the test project doesn't reference Sentry.Testing or whatever