vCPU Hotplug Performance Tests

[ghost]

Changes

Add non-CI performance tests for vCPU hot-plugging

Reason

To facilitate the performance analysis of vCPU hot-plugging (should it need to be analysed again)

License Acceptance

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license. For more information on following Developer Certificate of Origin and signing off your commits, please check CONTRIBUTING.md.

PR Checklist

• [ ] If a specific issue led to this PR, this PR closes the issue.
• [ ] The description of changes is clear and encompassing.
• [ ] Any required documentation changes (code and docs) are included in this PR.
• [ ] API changes follow the Runbook for Firecracker API changes.
• [ ] User-facing changes are mentioned in CHANGELOG.md.
• [ ] All added/changed functionality is tested.
• [ ] New TODOs link to an issue.
• [ ] Commits meet contribution quality standards.

---

• [ ] This functionality cannot be added in rust-vmm.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 81.94%. Comparing base (a541725) to head (1cb9072).

Files	Patch %	Lines
src/vmm/src/lib.rs	33.33%	4 Missing :warning:

Additional details and impacted files

@@                   Coverage Diff                    @@
##           feature/vcpu-hotplug    #4722      +/-   ##
========================================================
- Coverage                 81.95%   81.94%   -0.01%     
========================================================
  Files                       257      257              
  Lines                     31762    31768       +6     
========================================================
+ Hits                      26031    26033       +2     
- Misses                     5731     5735       +4     

Flag	Coverage Δ
5.10-c5n.metal	82.06% <33.33%> (-0.01%)	:arrow_down:
5.10-m5n.metal	82.05% <33.33%> (-0.01%)	:arrow_down:
5.10-m6a.metal	81.37% <33.33%> (-0.02%)	:arrow_down:
5.10-m6g.metal	79.21% <ø> (ø)
5.10-m6i.metal	82.04% <33.33%> (-0.01%)	:arrow_down:
5.10-m7g.metal	79.21% <ø> (ø)
6.1-c5n.metal	82.06% <33.33%> (-0.01%)	:arrow_down:
6.1-m5n.metal	82.05% <33.33%> (-0.01%)	:arrow_down:
6.1-m6a.metal	81.37% <33.33%> (-0.02%)	:arrow_down:
6.1-m6g.metal	79.21% <ø> (ø)
6.1-m6i.metal	82.05% <33.33%> (-0.01%)	:arrow_down:
6.1-m7g.metal	79.21% <ø> (ø)

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