.Net: Shared (Cross-Runtime) integration tests for Processes

[alliscode]

Motivation and Context

This PR introduces integration tests for Processes that are shared across all runtimes. This will allow us to run the exact same tests using all supported runtimes.

Description

This PR creates a few new projects that are needed to share the integration tests across runtimes.

• Process.IntegrationTests.Resources contains all the definitions or steps, state, processes, etc. that are used in the shared tests.
• Process.IntegrationTests.Shared contains all of the shared tests.
• Process.IntegrationTestRunner.Local is the test project that executes the shared tests against the Local runtime.
• Process.IntegrationTestRunner.Dapr is the test project that executes the shared tests against the Dapr runtime.
• Process.IntegrationTestHost.Dapr is the project that hosts Dapr tests in an ASP.NET Core Web API.

The PR enables all of these tests to run locally, a follow up PR will configure these tests to run in the GitHub pipeline.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[crickman]

Is there any trick to running this stuff locally? I'd like to leverage for map-step and error handler.