[CIVIS-7950] Add rspec instrumentation for test suite level visibility

[anmarchenko]

What does this PR do?
Adds RSpec instrumentation for test suite level visibility

Additional Notes
This change is mostly compatible with current rspec instrumentation except one important change:
test suite name for a test is now metadata[:example_group][:rerun_file_path] instead of metadata[:example_group][:file_path]. The reason for that is if ExampleGroup is defined in shared examples inside a context like that:

RSpec.shared_examples "Testing shared examples" do
  context "shared examples" do
    it "adds 1 and 1" do
      expect(1 + 1).to eq(2)
    end
  end
end

...then file_path contains the path of shared examples file whereas rerun_file_path contains the path of test file.

How to test the change?
There are open source projects I used for testing:
https://github.com/anmarchenko/middleman
https://github.com/anmarchenko/rubocop
https://github.com/anmarchenko/vagrant

Example of sesison trace for middleman specs:

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (b8c4124) 99.13% compared to head (b77fe2c) 99.10%.

Files	Patch %	Lines
lib/datadog/ci/test_visibility/recorder.rb	75.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #86      +/-   ##
==========================================
- Coverage   99.13%   99.10%   -0.03%     
==========================================
  Files         135      137       +2     
  Lines        5226     5391     +165     
  Branches      189      207      +18     
==========================================
+ Hits         5181     5343     +162     
- Misses         45       48       +3     

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