new(tests): introduce the first google benchmark

[Andreagit97]

What type of PR is this?

/kind feature

Any specific area of the project related to this PR?

/area tests

Does this PR require a change in the driver versions?

What this PR does / why we need it:

This PR introduces the first Google benchmark. This is just the scaffolding we should add more tests to it. For example, a good candidate could be the scap-file benchmark that we are running today in our perf CI @FedeDP

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[FedeDP]

Love this, thank you!
Any chance to update the CI jobs to also run benchmarks (so that for now we test that they build and work fine, but in the future we will actually use the benchmark data to generate diff from master)?

[github-actions]

Perf diff from master - unit tests

     6.82%     +1.10%  [.] sinsp::next
     5.19%     -1.08%  [.] sinsp_parser::process_event
     6.52%     -0.91%  [.] next
     3.57%     +0.87%  [.] sinsp_thread_manager::get_thread_ref
     5.88%     -0.82%  [.] sinsp_evt::get_type
     1.41%     -0.71%  [.] scap_event_encode_params_v
     0.91%     +0.68%  [.] sinsp_evt::get_ts
     1.75%     -0.53%  [.] std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*>
     1.22%     -0.48%  [.] std::_Hashtable<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::__detail::_Identity, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, true, true> >::find
     1.76%     +0.43%  [.] scap_event_decode_params

Heap diff from master - unit tests

peak heap memory consumption: 0B
peak RSS (including heaptrack overhead): 0B
total memory leaked: 0B

Heap diff from master - scap file

peak heap memory consumption: 0B
peak RSS (including heaptrack overhead): 0B
total memory leaked: 0B

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.21%. Comparing base (2b0fa60) to head (a05ffdf).
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2021   +/-   ##
=======================================
  Coverage   74.21%   74.21%           
=======================================
  Files         253      253           
  Lines       30845    30845           
  Branches     5400     5420   +20     
=======================================
  Hits        22893    22893           
- Misses       7925     7952   +27     
+ Partials       27        0   -27     

Flag	Coverage Δ
libsinsp	74.21% <ø> (ø)

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[Andreagit97]

we need at least version 3.11 for FetchContent

[FedeDP]

/approve

[poiana]

LGTM label has been added.

Git tree hash: 79dc8071fdc435e35fc47bd1f0d30ccd59aa41c8

[jasondellaluce]

/approve

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Andreagit97, FedeDP, jasondellaluce

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