feat: Use AWS SDK to invalidate using pulumi beforeExit hook

[H0R5E]

Changes:

• Call CloudFront invalidation using the AWS SDK triggered by pulumi's beforeExit hook. See https://www.pulumi.com/blog/next-level-iac-pulumi-runtime-logic/
• Drops the requirement for the AWS CLI to be installed
• README explicitly states that the Pulumi CLI should be installed

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 44.44444% with 30 lines in your changes are missing coverage. Please review.

Project coverage is 90.11%. Comparing base (f796d85) to head (4ecb252).
Report is 13 commits behind head on main.

Files	Patch %	Lines
stacks/main/resources.ts	14.28%	30 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #8      +/-   ##
==========================================
+ Coverage   86.61%   90.11%   +3.50%     
==========================================
  Files           8        8              
  Lines        1061     1002      -59     
  Branches       46       49       +3     
==========================================
- Hits          919      903      -16     
+ Misses        142       99      -43     

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[github-actions]

🎉 This PR is included in version 3.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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