Volttron-testing

* Sync develop from main by craig8 in https://github.com/eclipse-volttron/volttron-testing/pull/29


**Full Changelog**: https://github.com/eclipse-volttron/volttron-testing/compare/v0.3.1a28...v0.3.1a29

This candidate is the first release for the modular version of Eclipse VOLTTRON 10.0.0rc. In this modular structure, releases are a collection of modules each with their own versions under the overall release. The complete release plan is available [here](https://projects.eclipse.org/projects/iot.volttron/releases/10.0.0rc/plan).

This repository contains the testing infrastructure for VOLTTRON.

Features

- The volttrontesting namespace - utilities and tests for testing volttron-core as well as extensions to be used by agent developers.
- A PlatformWrapper class - ability to programmatically manipulate a volttron instance.
- TestServer - Allows a small pubsub library to send pubsub messages through the agent infrastructure.

**Full Changelog**: https://github.com/eclipse-volttron/volttron-testing/compare/v0.3.1a0...v0.4.0-rc

<!-- Release notes generated using configuration in .github/release.yml at refs/heads/develop -->

What's Changed
Fixed Bugs
* Pre platform wrapper by craig8 in https://github.com/eclipse-volttron/volttron-testing/pull/2
Other Changes
* Merge pull request 1 from craig8/fix-merge-issue-test-platform-wrapper by craig8 in https://github.com/eclipse-volttron/volttron-testing/pull/3
* Update downstream by craig8 in https://github.com/eclipse-volttron/volttron-testing/pull/21

**Full Changelog**: https://github.com/eclipse-volttron/volttron-testing/compare/v0.3.1a27...v0.3.1a28

**Full Changelog**: https://github.com/eclipse-volttron/volttron-testing/compare/v0.3.1a26...v0.3.1a27

**Full Changelog**: https://github.com/eclipse-volttron/volttron-testing/compare/v0.3.1a25...v0.3.1a26