Add integration tests, update to .NET 8

[kMutagene]

This PR

• implements a file-change-based CI pipeline
• Removes unnecessary build modules (we do not want to publish anything to nuget or host a full blown docs website for this repo)
• Updates the whole repo to .NET8
• adds the ArcPrototype as submodule to use it for integration tests
• adds some tests to ensure the submodule is set on a specific commit we have test fixtures for
• adds integration tests running the compiled tool to ensure correct arc_ro_crate_metadata, arc_summary, and isa_json files are created for the ArcPrototype.

[kMutagene]

General integration tests seem to work, summary file needs attention as it seems like the order of (sub) folders is not deterministic