feat: Add support for `default_instance_warmup` argument

[zwick]

• Added default_instance_warmup input to created autoscaling_group resource
• Added default_instance_warmup as optional number input
• Added default_instance_warmup documentation to README

Description

This change adds support for an optional input variable (default_instance_warmup) for the autoscaling_group resource being created. See autoscaling_group.

Motivation and Context

We had a need to modify the default warmup time behavior of ec2 instances in an Autoscaling Group. We are using this module and could only accomplish this by running a CLI command on the existing ASG, but the underlying resource supports assigning it in the Terraform resource.

Resolves #212

Breaking Changes

This change is additive and optional. There should be no breaking change.

I was not able to deploy the example for testing due to our organizations AWS permission restrictions, but I have updated the example to include the usage

How Has This Been Tested?

• [X] 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
• [X] I have executed pre-commit run -a on my pull request

[antonbabenko]

This PR is included in version 6.7.0 :tada:

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