migrate benchmarks to v0.3

[haydnv]

Can go in CL #21 . Ideally should use criterion.

[haydnv]

current benchmarks in the main branch: https://github.com/haydnv/ha-ndarray/tree/main/benchmark

[haydnv]

This should be submitted to the static_context branch as a separate pull request from #21

[haydnv]

The static_context branch has now been merged into main but the benchmarks have been preserved in the benchmark branch