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refactor(argparse): use list pattern and split_once in hyphen-value checks (#4159)

`should_parse_as_positional` peeked at the second character with
`get_char(1)` and a `Some/None` match; a nested list pattern
`['-', second, ..]` says the same thing in one shape and drops the
unreachable `None` arm (the preceding guards already rule out `-` and
`--...`).

`split_long` split on `=` and rejoined the tail to recover the inline
value; `split_once` matches the first separator directly, avoiding the
intermediate array and the rejoin.

Add a test covering the short-flag tail: a known short flag wins over an
`allow_hyphen_values` positional, while an unknown short token is
consumed as a positional value.

Co-authored-by: SeekMoon <noreply@moonbitlang.cn>

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