# Description
Implements streaming for:
- `from csv`
- `from tsv`
- `to csv`
- `to tsv`
via the new string-typed ByteStream support.
# User-Facing Changes
Commands above. Also:
- `to csv` and `to tsv` now have `--columns <List(String)>`, to provide
the exact columns desired in the output. This is required for them to
have streaming output, because otherwise collecting the entire list is
necessary to determine the output columns. If we introduce
`TableStream`, this may become less necessary.
# Tests + Formatting
- 🟢 `toolkit fmt`
- 🟢 `toolkit clippy`
- 🟢 `toolkit test`
- 🟢 `toolkit test stdlib`
# After Submitting
- [ ] release notes
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Co-authored-by: Ian Manske <ian.manske@pm.me>
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