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Summary

TiCDC Canal-JSON intentionally represents binary column bytes as ISO-8859-1 code points in a JSON string. Converting the decoded string as UTF-8 changes bytes above 0x7f; for example, 0x80 becomes c280 and 0xff becomes c3bf.

This PR adds latin1, latin-1, and iso-8859-1 formats to TO_BINARY and TRY_TO_BINARY so consumers can restore the original bytes without changing the Canal-JSON pipeline.

SELECT TO_HEX(
  TO_BINARY(
    AS_STRING(GET(PARSE_JSON('{"v":"\u0000A\u007f\u0080\u00ff"}'), 'v')),
    'latin1'
  )
);
-- 00417f80ff

TiCDC documents this encoding for binary columns and implements it with an ISO-8859-1 decoder:

• https://github.com/pingcap/docs/blob/ceff62e44f9e1c6552d6478bf162bc92aa2d1189/ticdc/ticdc-canal-json.md#L262-L299
• https://github.com/pingcap/tiflow/blob/4880637e6cd6daa67cf0e2f4810f1120ad90e58a/pkg/sink/codec/canal/canal_entry.go#L80-L117

Implementation

• Encode each Unicode code point in U+0000..U+00FF as its corresponding single byte.
• Make TO_BINARY reject code points above U+00FF instead of truncating them.
• Make TRY_TO_BINARY return NULL for unrepresentable input.
• Preserve the existing nullable and vectorized function behavior.

The change is backward compatible: existing hex, base64, and utf-8 formats are unchanged.

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

Validation performed on origin/main at b6a88c6930:

• cargo fmt --check -- src/query/functions/src/scalars/binary.rs src/query/functions/tests/it/scalars/binary.rs
• cargo test -p databend-common-functions --test it test_binary -- --nocapture
• cargo clippy -p databend-common-functions --lib --tests -- -D warnings
• cargo build --bin databend-query --bin databend-sqllogictests
• databend-sqllogictests for 03_0041_insert_into_binary.test with both MySQL and HTTP handlers (20 assertions per handler)

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

AI assistance

• AI usage: An AI coding agent researched the TiCDC/Canal encoding contract, implemented the scalar function and regression tests, and drafted this PR description.
• Responsible human: @dbsid
• The responsible human has read every line of this diff and can explain each change

This change is