feat(basti): EBS volume encrypted

[GustavoAdrianGimenez]

Proposed Changes

To enhance security, it's important to attach encrypted EBS volumes for EC2 instances.

Related Issues/PRs

https://github.com/basti-app/basti/issues/94

Checklist

• [x] I cleaned up my code.
• [x] All the tests and checks passed (npm run test).
• [x] I have added necessary documentation and/or updated existing documentation.
• [ ] I have added or modified tests to cover the changes.

[BohdanPetryshyn]

Just tested the changes both in Basti CLI and Basti CDK. Works like a charm!

[BohdanPetryshyn]

Basti CLI has just been released. Basti CDK will be released tomorrow.