Run performance comparison in CI using Kani's Benchcomp

[tautschnig]

Use proof harnesses in AWS C Common as (initial) benchmark to guard against performance regressions introduced in PRs. See the "Summary" behind any of the executions of
https://github.com/model-checking/kani/actions/workflows/bench.yml for examples what the output will look like.

• Each commit message has a non-empty body, explaining why the change was made.
• n/a Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• n/a The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• n/a My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• n/a White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.64%. Comparing base (baaccb6) to head (ddb4060).

Additional details and impacted files

@@ Coverage Diff @@## develop #8171 +/- ##
========================================
Coverage 79.64% 79.64% ========================================
Files 1684 1684 Lines 195661 195661 ========================================
Hits 155837 155837 Misses 39824 39824 

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[karkhaz]

I have finally gotten round to this, sorry for the delay. Thank you so much for adding this!

[tautschnig]

Will wait for model-checking/kani#3077 to be merged: with that one we'll also get scatterplots (see that PR for examples).

[tautschnig]

https://github.com/diffblue/cbmc/actions/runs/8356289780 now includes examples of scatterplots.