Design proposal for a consolidated Troubleshoot CLI

[xavpaice]

Create a design proposal to clarify and detail the required changes to the project to implement #933

[xavpaice]

Let's include:

• a standard start command that covers the entire project
• sub-commands to capture all the existing binaries
• sbctl invocation both as a shell and as a server
• version (consider use of https://github.com/mszostok/version to replace the existing version tooling included today
• Ideally, the commands would all invoke a new stable public API entry point which can be accessed by other projects that import the Troubleshoot codebase

The design proposal should include a summary roadmap to getting the new CLI implemented