Marco montero/review low variance sampling

[marco-montero]

Proposed changes

This PR adds the strategy of low-variance sampling for the resampling step. Adds a new range adaptor called beluga::views::low_variance_sample. Related to: #48

Type of change

• 🐛 Bugfix (change which fixes an issue)
• 🚀 Feature (change which adds functionality)
• 📚 Documentation (change which fixes or extends documentation)

💥 Breaking change! Explain why a non-backwards compatible change is necessary or remove this line entirely if not applicable.

Checklist

Put an x in the boxes that apply. This is simply a reminder of what we will require before merging your code.

• Lint and unit tests (if any) pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• All commits have been signed for DCO

Additional comments

How to run it?

colcon build --packages-up-to beluga && ./build/beluga/test/beluga/test_beluga --gtest_filter="LowVarianceSampleView"

[hidmic]

This looks great @marco-montero (and @larodriguez22), with green CI of course.

How does this fare in micro benchmarks?

[hidmic]

Also, mind to update the PR title to be more descriptive?