Snowflake: support wildcard with EXCLUDE in function arguments

[yoabot-droid]

Summary

Adds support for Snowflake's HASH(* EXCLUDE(col, ...)) syntax — a wildcard with column exclusions used as a function argument.

Motivation

The following Snowflake SQL pattern was not parseable:

SELECT * FROM (
    SELECT *, HASH(*) HASH
    FROM (
        SELECT created_at::TIMESTAMP_NTZ AS created_at,
               updated_at::TIMESTAMP_NTZ AS updated_at,
               * EXCLUDE(load_date, created_at, updated_at)
        FROM mydb.public.events
    )
) S
FULL JOIN (
    SELECT *, HASH(* EXCLUDE(load_date)) HASH
    FROM mydb.archive.events_20260101
) T USING(HASH)
WHERE T.HASH IS NULL;

Changes

• src/ast/mod.rs: Added FunctionArgExpr::WildcardWithOptions(WildcardAdditionalOptions) variant to represent * EXCLUDE(...) as a function argument expression.
• src/ast/spans.rs: Added span handling for the new variant (returns empty span, same as plain Wildcard).
• src/parser/mod.rs: In parse_function_args, after parsing a wildcard expression, if the dialect supports * EXCLUDE (e.g. Snowflake), attempt to parse wildcard additional options. If any options are present, wrap in WildcardWithOptions.
• tests/sqlparser_common.rs: New test_wildcard_func_arg test covering HASH(* EXCLUDE(col)) for dialects that support wildcard EXCLUDE.

Notes

• HASH(*) already worked before this change; only HASH(* EXCLUDE(...)) was broken.
• The canonical form normalizes EXCLUDE(cols) → EXCLUDE (cols) (space before parenthesis), matching the existing ExcludeSelectItem::Multiple display format.
• Verified against Snowflake HASH docs — EXCLUDE and ILIKE qualifiers inside HASH(*) are officially documented.
• All existing tests pass.