[PM-18100] Add mlock and memfd_secret implementations

[dani-garcia]

🎟️ Tracking

📔 Objective

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation
  team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed
  issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[github-actions]

Checkmarx One – Scan Summary & Details – ef2f96a1-6353-4b8b-951a-e832b2f98fc1

Great job, no security vulnerabilities found in this Pull Request

[codecov]

Codecov Report

Attention: Patch coverage is 98.85434% with 7 lines in your changes missing coverage. Please review.

Project coverage is 67.14%. Comparing base (6008e90) to head (3bf0b24).

Files with missing lines	Patch %	Lines
...c/store/backend/implementation/custom_slice/mod.rs	98.67%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #125      +/-   ##
==========================================
+ Coverage   65.91%   67.14%   +1.23%     
==========================================
  Files         196      197       +1     
  Lines       15333    15920     +587     
==========================================
+ Hits        10106    10689     +583     
- Misses       5227     5231       +4     

☔ View full report in Codecov by Sentry.
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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud