refactor repo architecture

changelog

• src/main.rs has been moved to a new crate: bins/saclin which stands for Semi-AVID CLI in Nushell
• dependencies of komodo have been fixed
• Nushell and Rust tests have been split in the Makefile: by default, only Rust tests will run locally and Nushell tests and examples can be run manually if desired. The CI will still run everything.
• the README has been updated
• test images have been moved to assets/
• the majority of the old ./nu-utils/ module have been moved to internals of ./benchmarks/ and imports have been fixed
• cargo.nu has been moved to ./bins/ and a new ./bins/README.md mentions it
• ./bins/saclin/ has been created and should be a self-contained Rust crate + Nushell module