Use JSON polymorphism to (de)serialize Alexa requests and responses.

Update to the latest daily build of .NET 9.

Attempt to debug JSON payloads.

* Update .NET SDK

Update .NET SDK to version 9.0.100-rc.2.24462.3.

---
updated-dependencies:
- dependency-name: Microsoft.NET.Sdk
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: costellobot <102549341+costellobot@users.noreply.github.com>

* Bump .NET NuGet packages

Bumps .NET dependencies to their latest versions for the .NET 9.0.100-rc.2.24462.3 SDK.

Bumps Microsoft.AspNetCore.WebUtilities from 9.0.0-rc.2.24460.5 to 9.0.0-rc.2.24461.26.
Bumps Microsoft.Extensions.Configuration.Binder from 9.0.0-rc.2.24459.11 to 9.0.0-rc.2.24461.13.
Bumps Microsoft.Extensions.Configuration.EnvironmentVariables from 9.0.0-rc.2.24459.11 to 9.0.0-rc.2.24461.13.
Bumps Microsoft.Extensions.Configuration.Json from 9.0.0-rc.2.24459.11 to 9.0.0-rc.2.24461.13.
Bumps Microsoft.Extensions.DependencyInjection from 9.0.0-rc.2.24459.11 to 9.0.0-rc.2.24461.13.
Bumps Microsoft.Extensions.Http from 9.0.0-rc.2.24459.11 to 9.0.0-rc.2.24461.13.
Bumps Microsoft.Extensions.Logging.Console from 9.0.0-rc.2.24459.11 to 9.0.0-rc.2.24461.13.
Bumps System.Text.Json from 9.0.0-rc.2.24459.11 to 9.0.0-rc.2.24461.13.

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.WebUtilities
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: Microsoft.Extensions.Configuration.Binder
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: Microsoft.Extensions.Configuration.EnvironmentVariables
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: Microsoft.Extensions.Configuration.Json
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: Microsoft.Extensions.DependencyInjection
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: Microsoft.Extensions.Http
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: Microsoft.Extensions.Logging.Console
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: System.Text.Json
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: costellobot <102549341+costellobot@users.noreply.github.com>

---------

Signed-off-by: costellobot <102549341+costellobot@users.noreply.github.com>

Add more logging to see where the hang is happening.

Avoid deadlock in AoT tests when writing to the console.

Disable the tests entirely - will probably cause a deadlock when deployed, but let's see...

Do not await the handler to see if the things get logged.

Disable logging to the console.

What happens if we force things to try and not be async...

Go back to being async.

Disable AoT.

Skip using the base class.

Fix typo.

Call the original method.

Re-enable AoT.

Disable AllowOutOfOrderMetadataProperties - it _should_ just blow up.

It does indeed go boom.

Add reference to Microsoft.Dotnet.ILCompiler containing a fix for what may be the cause.

Try to fix error from cross-compilation.

Get back to how it should be as much as possible.

Re-enable the tests.