hashsum: support --text --tag for GNU compat

[oech3]

GNU accepts md5sum --text --tag while rejecting --tag --text.
It is able to support on cksum with clap-based arg management. But difficult to support it on hashsum without adding --untagged due to clap's bug: clap-rs/clap#4520

This PR supports md5sum --tag --text by adding masked --untagged and make --text depends on it. We can add error something lile

`md5sum: --untagged is supported only on cksum

if needed.

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/cksum/b2sum. tests/cksum/b2sum is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/cksum/md5sum. tests/cksum/md5sum is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/cksum/md5sum-bsd. tests/cksum/md5sum-bsd is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/cksum/md5sum-newline. tests/cksum/md5sum-newline is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/cksum/sha1sum. tests/cksum/sha1sum is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/cksum/sha1sum-vec. tests/cksum/sha1sum-vec is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/cksum/sha224sum. tests/cksum/sha224sum is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/cksum/sha256sum. tests/cksum/sha256sum is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/cksum/sha384sum. tests/cksum/sha384sum is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/cksum/sha512sum. tests/cksum/sha512sum is passing on 'main'. Maybe you have to rebase?

[codspeed-hq]

CodSpeed Performance Report

Merging this PR will improve performance by 3.05%

_{Comparing oech3:hashsum-text-tag (e635c78) with main (130f780)}

Summary

⚡ 1 improved benchmark
✅ 138 untouched benchmarks
⏩ 37 skipped benchmarks¹

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	tsort_input_parsing_heavy[5000]	73.1 ms	70.9 ms	+3.05%

Footnotes

1. 37 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[oech3]

@RenjiSann Any idea about supporting md5sum --text --tag without regression?
(without clap)

[RenjiSann]

@RenjiSann Any idea about supporting md5sum --text --tag without regression? (without clap)

The previous code handled it like a charm, so it shouldn't be too much of a problem

[oech3]

So we just forgot to add Rust native test and GNU is missing the test case?

[RenjiSann]

I guess I forgot it yes 😔

[oech3]

If we have cksum doing it already, we can fix hashsum by cksum's codebase:
#10096