[Engine] Provide base project architecture with essential dev tools

[Superskyyy]

• [x] A fundamental Plugin framework.
• [x] An gRPC data ingestor provider, I will provide a working example for log, it can be used as an example to write plugins.
• [x] Basic engine flow showcase docs (based on log clustering, Drain3)
• [x] Dev documentation (underway, @Fengrui-Liu @Liangshumin please familiarize yourself with poetry if you haven't.)
• [x] Testing setup
• [x] Testing dataset manager CLI (downloads and extracts common datasets for developers)
• [x] Linter (CI, Makefile)
• [x] License checker (SkyWalking-eyes) (CI)
• [ ] Add a simple server starter as user CLI and for standalone/module deployment.

I'm working on this task.

[Fengrui-Liu]

Great!

Have you finished the plugin framework? Where can I find it?

[Superskyyy]

Great!

Have you finished the plugin framework? Where can I find it?

I'm gonna start to PR each of the components mentioned above within this week.