Drop Messaging/Stream/Integration/SpEL

[bart-vmware]

Description

Following up on the announcement at #1244, this PR removes several Steeltoe components:

• Steeltoe.Messaging
• Steeltoe.Stream
• Steeltoe.Integration
• Steeltoe.Common.Expression (SpEL)
• Several parts in Steeltoe.Common that were used only by the above (see individual commits)

Additionally, adds test projects for Prometheus and Wavefront to the solution that existed on disk but were not included.

#1221, #1014, #980, #907, #906, #903, #838, #789, #775, #749, #739, #649, #601, #582, #487, #400, #392, #336, #300, #242, #133, #132.

Quality checklist

• Your code complies with our Coding Style.
• You've updated unit and/or integration tests for your change, where applicable.
• You've updated documentation for your change, where applicable.
  If your change affects other repositories, such as Documentation, Samples and/or MainSite, add linked PRs here.
• There's an open issue for the PR that you are making. If you'd like to propose a new feature or change, please open an issue to discuss the change or find an existing issue.
• You've added required license files and/or file headers (explaining where the code came from with proper attribution), where code is copied from StackOverflow, a blog, or OSS.

[bart-vmware]

/azp run Steeltoe.All

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[TimHess]

Please remove IApplicationContext, ILifecycle and everything stemming from Common.Abstractions/Retry and then this round will be done

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[sonarqubecloud]

Quality Gate passed

The SonarCloud Quality Gate passed, but some issues were introduced.

2 New issues
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud