benchmarks: Implement/Improve more benchmarks.

[coveralls]

Pull Request Test Coverage Report for Build 4005617814

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 53.642%

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Totals
Change from base Build 3996338444:	0.0%
Covered Lines:	30549
Relevant Lines:	56950

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💛 - Coveralls

[duesee]

Where do the large changes in performance come from compared to main?

I increased HKDF's okm size for sanity testing. 128 was motivated by HKDF's usage in protocols such as TLS and I feel that it was a good value already. So I reverted this change, which we should hopefully see in the next CI run :-)

The comparison script needs to be updated to print nice output again.

Will do :+1:

With the number of benchmarks we have here now we should probably output a json, or whatever the framework offers, to make it easier to digest with tools.

As discussed off-GitHub, let's do that in a follow-up.