Add gperftools profiler

[dabele]

Changes and Information

• Integrated gperftools for profiling into cmake
• added documentation about gperftools usage and general profling

@DavidKerkmann maybe you could give gperftools on MacOS a try? I haven't been able to find reliable information about whether it works or how to get it. apparently homebrew should work?

Closes #1053

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.23%. Comparing base (9022c7c) to head (643f65e). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1054 +/- ## ======================================= Coverage 96.23% 96.23% ======================================= Files 128 128 Lines 10852 10867 +15 ======================================= + Hits 10443 10458 +15 Misses 409 409 ```

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[dabele]

added documentation for the cmake option (including some others that were added recently).

added links to profiling to the cpp README.