Add `inferno-ml` package with types & primitives for tensors and ML models

[siddharth-krishna]

This PR:

• Adds inferno-ml package with ML types and primitives for inferno
• Adds inferno-ml and inferno-lsp-server executables that allow running/type checking ML inferno scripts using the above package
• Adds nix magic to build above using Hasktorch, courtesy @ngua
• Adds some examples/tests showing how to load pretrained ML models into Inferno via TorchScript