Migrate api-gateway layer resources to root module

[Donovan1905]

Description

Description

Deploy the resources previously declared in the api-gateway layer using a submodule that is called from the iroco2-terrafmodules root module.

Actions

Move all the resources from layers/api-gateway into a submodule. Call and implement this submodule form the root module.

Acceptance Criteria

• No resources remain in api-gateway layer and layers/api-gateway/ has bee deleted
• Deployment of api-gateway related resources is possible using the submodule

Additional information

No response