AfterShip / clickhouse-sql-parser / 40629705256

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Fix MODIFY COLUMN parsing when the data type is omitted (#338)

ALTER TABLE ... MODIFY COLUMN can reject valid modifier-only changes or
store a modifier as the column type. Modifier keywords are treated as
type names when the declaration omits its data type.

For example, CODEC(LZ4) is stored in Column.Type instead of Column.Codec,
while a leading COMMENT causes parsing to fail. This bug predates #337.

Recognize COMMENT, CODEC and TTL as modifiers when the type is omitted,
preserving their AST fields through formatting and reparsing. Preserve
explicit-type parsing and duplicate-modifier rejection, and regenerate
the AST and formatting fixtures for the affected ALTER statements.

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