feat: include benchmark dir in bundle

[drbh]

This PR simply includes the benchmark directory in the bundle so they will be uploaded in release builds

tested locally on mbp

cd kernels-community/relu
nix run .#build-and-copy -L

tree build -L 2

output

build
├── benchmarks
│   └── benchmark.py
├── torch210-metal-aarch64-darwin
│   ├── __init__.py
│   ├── _ops.py
│   ├── _relu_26740b1_dirty.abi3.so
│   ├── metadata.json
│   └── relu
└── torch29-metal-aarch64-darwin
    ├── __init__.py
    ├── _ops.py
    ├── _relu_26740b1_dirty.abi3.so
    ├── metadata.json
    └── relu

6 directories, 9 files