cksum: Back support for -a blake3 and -a shake*

[oech3]

Closes #10002

[codspeed-hq]

CodSpeed Performance Report

Merging #10031 will degrade performance by 99.78%

_{Comparing oech3:cksum3b (41a4c3c) with main (81ee8d1)}

Summary

❌ 1 regression
✅ 138 untouched
⏩ 37 skipped¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Efficiency
❌	cksum_blake3	209.7 µs	93,293.4 µs	-99.78%

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]

So we were benching blake3's error message...

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/shuf/shuf-reservoir. tests/shuf/shuf-reservoir is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/sort/sort-stale-thread-mem. tests/sort/sort-stale-thread-mem is passing on 'main'. Maybe you have to rebase?
Note: The gnu test tests/printf/printf-surprise is now being skipped but was previously passing.

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/timeout/timeout (passes in this run but fails in the 'main' branch)

[oech3]

@sylvestre No performance regression by this PR. We were benchmarking a bunch of error messages for broken cksum -a blake3.