feat: Added Custom policy name Input variable to able to keep Custom policy name

[vibhamsharma]

Added Custom Policy name as variable to able to pass

Description

I have added optional variable of custom policy name so we can create custom policy with custom name as we can do for pre-existing add ons policy like alb controller, vpc-cni etc.

Motivation and Context

This change is required to create Custom IAM Policy with custom name.

#30

Breaking Changes

No, as I have tested without passing policy name and it was picking up role name as it was doing earlier

NA

How Has This Been Tested?

• I cloned this module in my local and refer my code to use local module.
• Then I update module code and run terraform plan in my existing repo having roles & policies created with previous version module. Terraform plan showed zero changes, so it was confirmed that it will not break any existing code.
• Then I added custom policy name as input while calling module and it recreated policies and policy attachment with my custom name
• I have executed pre-commit run -a on my pull request

[vibhamsharma]

Important commits got missed so Closing and created new PR with all required commits

[github-actions]

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