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* Move to moe-kernels package and switch to common MoE layer

This change introduces the new `moe-kernels` package:

- Add `moe-kernels` as a dependency.
- Introduce a `SparseMoELayer` module that can be used by MoE
  models.
- Port over Mixtral and Deepseek.

* Make `cargo check` pass

* Update runner

Enables LoRA support.

Updates tgi-nix input:

- Move Torch closer to upstream by building against MKL.
- Remove compute capability 8.7 from Torch (Jetson).
- Sync nixpkgs cumpute capabilities with Torch (avoids
  compiling too mana capabilities for MAGMA).
- Use nixpkgs configuration passed through by `tgi-nix`.

* nix: pure server and support both pure and impure devShells

* nix: remove unused poetry2nix input

It is not wired up and we now have a pure server.

* nix: add ipdb to impure devshell