feat: Support elasticache serverless cache

[magreenbaum]

Description

Add support for creating elasticache serverless cache. Closes: https://github.com/terraform-aws-modules/terraform-aws-elasticache/issues/1

Motivation and Context

Closes: https://github.com/terraform-aws-modules/terraform-aws-elasticache/issues/1

Breaking Changes

No.

How Has This Been Tested?

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

[antonbabenko]

This PR is included in version 1.1.0 :tada:

[github-actions[bot]]

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