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]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

Additional details and impacted files

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  Coverage   96.23%   96.23%           
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  Files         128      128           
  Lines       10852    10867   +15     
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+ Hits        10443    10458   +15     
  Misses        409      409           

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[reneSchm]

I could not get this to work on the cluster, but it looks good otherwise.
In the cpp/README.md the entry for the benchmark dir is missing, maybe we could add something like

- benchmarks: applications to measure the performance of the framework. More information on profiling [can be found here](benchmarks/profiling.md).

so that the documentation is easier to find. I had to look at the "Files changed" tab to locate it.
Also, please add a description for "MEMILIO_ENABLE_PROFILING" in the "Configuring using CMake" section.

[dabele]

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

added links to profiling to the cpp README.

[reneSchm]

Thanks for writing all this documentation!

I could verify the gperf steps work on native Linux, the Cluster should work as well, but had some issues possibly due to spack quirks.

[DavidKerkmann]

I was able to run the profiler on MacOS 11.7.10.
It was important to also install the PkgConfig, I think we didn't have this as a requirement before. Perhaps we can add this to the installation process?
One thing that didn't work is the conversion of the .out file to .pdf, as proof-symbolize tries to access libs that were moved with MacOS 11. I am not sure how to resolve this. Here is some more information:

error: /Library/Developer/CommandLineTools/usr/bin/otool-classic: can't open file: /usr/lib/liboah.dylib (No such file or directory)
and about 100 similar more.

Here's a thread about this on apple.com:
https://developer.apple.com/forums/thread/655588?answerId=623718022#623718022

And another issue (thanks René) that lists the same problem:
google/pprof#726