ci: Add continuous benchmarking for the hot path

[kakkoyun]

It would be amazing to run benchmark tests continuously and compare them against the latest head of the main to catch the performance regressions as early as possible.

The first step would be to add all the necessary benchmark tests for the hot path. Then one of the following tools can be used

• https://github.com/swaggest/rest/blob/master/.github/workflows/bench.yml
• https://github.com/knqyf263/cob
• https://github.com/bobheadxi/gobenchdata

[Namanl2001]

@kakkoyun I think this is a good issue for me to dive into the parca-agent codebase. WDYT?

can you help me with the hot paths, that needs the benchmark tests to be added?

[kakkoyun]

Go ahead, please. Basically, everything in profiling the CPU path would be nice to have. You can start small, though try to run existing benchmarks continuously for a given interval for example (e.g. once week)