feat(minor): Add support for metricP90AbsoluteThresholds export format

[hassila]

Description

This provides better out-of-the-box experience for absolute checks and is geared towards CI checking of e.g. malloc/syscall deviations. The thresholds are expected to be in a "Thresholds" directory.

To generate a new baseline, run e.g.

swift package --allow-writing-to-package-directory benchmark --format metricP90AbsoluteThresholds --path Thresholds/

To run a check vs. the saved thresholds, run:

swift package benchmark baseline check --check-absolute-path /relative/or/absolute/path/to/Thresholds

See the P90AbsoluteThresholds sample benchmark target for typical usage.

How Has This Been Tested?

Manual testing, added additional benchmark target.

Minimal checklist:

• [x] I have performed a self-review of my own code
• [x] I have added DocC code-level documentation for any public interfaces exported by the package
• [x] I have added unit and/or integration tests that prove my fix is effective or that my feature works

[codecov[bot]]

Codecov Report

Merging #180 (837cdb2) into main (6e0a077) will not change coverage. The diff coverage is 100.00%.

Additional details and impacted files

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[github-actions[bot]]

Pull request benchmark comparison [ubuntu-latest] with 'main' run at 2023-08-23T15:25:05+00:00 Pull request had performance regressions