feat: Adjust optional params for the aws_customer_gateway, add device_name and certificate_arn

[Art3mK]

Description

Adding optional param device_name to the cgw

Motivation and Context

I've got few existing VPN tunnels I'd like to move under tf management, and some cgws have that device_name set, but module doesn't allow to set it. Missing device_name results in cgw recreation.

Breaking Changes

n/a

How Has This Been Tested?

• [ ] 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

Trivial change, so just tested in my env this solves the problem.