Interactive mode for concore init CLI

[GREENRAT-K405]

Currently, concore init defaults to creating a single-node Python project. As Concore supports multiple languages (Python, C++, Octave, Verilog, etc.), the initialization process should allow users to bootstrap multi-language projects more easily.

I think we should add --interactive mode to it.

• prompt users which language nodes to include
• automatically generate a workflow.graphml with these nodes