feat: Add input variable 'instance_tags'

[luigidifraiawork]

Description

Add input variable instance_tags, similarly to the VPC module's vpc_tags.

Motivation and Context

It allows for fine grained tagging of EC2 instances that can be used by automation tools to perform certain actions, such as cost-saving measures by shutting down instances outside of working hours if they are tagged with e.g., Persistence = "09:00-18:00". With this change in place, the extra instance tag would not be set for the volume or IAM role but just for the instance itself, which is the only place where it makes sense.

Breaking Changes

None.

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 5.2.0 :tada:

[github-actions[bot]]

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