feat: integration tests

[aripalo]

• Add CDK integ testing to verify the deployed resources look as they should
• Configured gitleaks (as an pnpm script, pre-commit hook, and GitHub action) to prevent accidentally committing (and exposing) secrets or other sensitive'ish data (such as AWS Account IDs in integration snapshots)
• Create basic contribution guides

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (3cd080e) to head (aad6bf7).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #46   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          247       247           
  Branches         2         9    +7     
=========================================
  Hits           247       247           

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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

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