Zstd encoding not considered for binary types

[mwlon]

What happened?

With the compact compression strategy, we currently only consider utf-8 data types: https://github.com/vortex-data/vortex/blob/0.73.0/vortex-btrblocks/src/schemes/string.rs#L238-L240

Zstd encoding should be able to work on any binary data.

Steps to reproduce

import os

import pyarrow as pa
import vortex as vx

n = 1_000_000
value = "abcd" * 16  # 64 bytes, valid UTF-8, trivially compressible
raw_bytes = n * len(value.encode())

for name, arr in [
    ("utf8", pa.array([value] * n, pa.string())),
    ("binary", pa.array([value.encode()] * n, pa.binary())),
]:
    path = f"{name}.vortex"
    vx.io.VortexWriteOptions.compact().write(pa.table({"col": arr}), path)
    size = os.path.getsize(path)
    print(f"{name:6s} compact: {size:>12,} bytes  (raw {raw_bytes:,}, ratio {size / raw_bytes:.4f})")

gives:

utf8   compact:       16,060 bytes  (raw 64,000,000, ratio 0.0003)
binary compact:   80,032,676 bytes  (raw 64,000,000, ratio 1.2505)

Environment

Vortex 0.73.0
Python 3.12
MacOSX

Additional context

No response

[AdamGS]

I actually have a branch that adds it, just got lost in other work, I'll do pull it out into it's own PR tomorrow

[mwlon]

@AdamGS did you end up cutting a branch for this?

[AdamGS]

Lost the PR in the shuffle, ended up being #8304 which is now merged.