feat: Initial support for aws's bottlerocket os

[rverma-jm]

PR o'clock

Description

Added userdata template for bottle rocket.

Checklist

• CI tests are passing
• README.md has been updated after any changes to variables and outputs. See https://github.com/terraform-aws-modules/terraform-aws-eks/#doc-generation

[barryib]

Thanks @rverma-jm for opening this PR. This module is getting quite complex and was discussed in #635 or #774, many other issues so I don't think we'll support a new OS soon.

We can discuss this again here and see if there is a benefit to add this support knowing that you can already provide a custom template for userdata with userdata_template_file and userdata_template_extra_args

[github-actions]

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