feat: Enable acceleration support

[james-martinez]

Description

Added bool var for acceleration support. Added terraform parameter in each vpn resource to reference the var.

An accelerated Site-to-Site VPN connection (accelerated VPN connection) uses AWS Global Accelerator to route traffic from your on-premises network to an AWS edge location that is closest to your customer gateway device. AWS Global Accelerator optimizes the network path, using the congestion-free AWS global network to route traffic to the endpoint that provides the best application performance (for more information, see AWS Global Accelerator).

Motivation and Context

https://docs.aws.amazon.com/vpn/latest/s2svpn/accelerated-vpn.html

Resolves #98

Breaking Changes

No breaking changes

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]

Please fix the failing CI runs (and docs).

[james-martinez]

Can someone test the example? I don't have an aws account to deploy the example.

Thanks