refactor(GCP): Create Modules

[afiune]

User Story

As a Lacework user that uses Terraform to configure Lacework and Google Cloud resources,
I would like to have reusable modules that I can plug-and-play into my internal Terraform plans,
So I don't have to clone this repository and I can use all my best practices to use Terraform internally.

JIRA: ALLY-148

Acceptance Criteria

When completed, we will have the following modules:

• config module that will configure both sides, Lacework's and Google's resources to create a GCP Config Integration.

module "gcp_config" {
	source = "github.com/lacework/terraform-provisioning/gcp/modules/config"
}

• audit_log module that will configure both sides, Lacework's and Google's resources to create a GCP Audit Log integration.

module "gcp_cloudtrail" {
	source = "github.com/lacework/terraform-provisioning/gcp/modules/cloudtrail"
}