Hash built parquet files

[csjh]

Description

Hashes parquet files when projects are built via the evidence cli

The logic here is a bit weird to try to align w/ the process.env.EVIDENCE_DATA_DIR and process.env.EVIDENCE_DATA_URL_PREFIX env vars

The main sketchy part is the static directory "disappearing" when static is copied into the build directory, and since we want to(?) allow custom static directory naming (via svelte.config.js), it's hard to determine the location of manifest.json (though its location is hardcoded as ./static/data/manifest.json in some places which is a whole other problem)

I think if we officially decide you can't have a custom static directory location it can be simplified more (but then I have more complaints about process.env.EVIDENCE_DATA_DIR and process.env.EVIDENCE_DATA_URL_PREFIX

Checklist

• I have added a changeset