feat: Add `create_kms` variable

[junha-ahn]

Description

Add new variable create_kms variable it creates a new kms

Motivation and Context

356

For now, ec2 moudule just use key_name variable

If you input key_name, It find the (already exist) Key Pair on AWS. dosen't craete a new key pair, so you have to create key manually

So, I just add create_kms variable it creates a new kms

Breaking Changes

New Variable

• create_kms Boolean

New Output

• kms aws/KMS Module

How Has This Been Tested?

• [ ] I have updated at least one of the examples/* to demonstrate and validate my change(s)
• [ ] I have tested and validated these changes using one or more of the provided examples/* projects
• [ ] I have executed pre-commit run -a on my pull request

[junha-ahn]

Thank you!

[github-actions[bot]]

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