docs: Document compressed file extension auto-detection

[lukekim]

Summary

Listing data connectors now auto-detect both file format and compression codec from compound file extensions such as .csv.gz, .jsonl.zst, .tsv.xz, and .json.bz2. No file_compression_type parameter is required for the recognized suffixes (.gz, .bz2, .xz, .zst).

Source PRs

• Add compressed file support for listing connectors spiceai#10809 — Add compressed file support for listing connectors

Changes

• website/docs/reference/file_format.md
  • Updated the Common Parameters table to note that file_extension accepts compound extensions and file_compression_type is now inferred when unset.
  • Added a new "Compressed File Extensions" section documenting the inference rules, a path-to-format/compression mapping table, and an example.

Test plan

• cd website && npm run build passes locally
• Compression suffix list (gz, bz2, xz, zst) verified against parse_extension_components / compression_from_extension in crates/runtime/src/dataconnector/listing/mod.rs
• Format extension list verified against is_structured_format and default_jsonl_extension in the same PR

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🔍 Pull with Spice Failed

Passing checks:

• ✅ Title meets minimum length requirement (10 characters)
• ✅ Has at least one of the required labels: area/blog, area/docs, area/cookbook, dependencies
• ✅ No banned labels detected

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[github-actions]

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