[AWS::EC2::TransitGatewayPolicyTable] - [Coverage] - add TransitGatewayPolicyTable support

### Name of the resource

AWS::EC2::TransitGateway

### Resource name

AWS::EC2::TransitGatewayPolicyTable

### Description

Currently CloudFormation doesn't support `TransitGatewayPolicyTable`. It will be much harder to use `TransitGateway` with CloudFormation in complex scenarios.

### Other Details

_No response_

The issue requests CloudFormation support for AWS::EC2::TransitGatewayPolicyTable, alongside AWS::EC2::TransitGateway. No implementation files, tests, entry points, or acceptance checks are identified in the payload, so first confirm where resource coverage is defined and what support must include. Done should be demonstrated by the repository's relevant coverage checks for this resource.

Written by the indexing model from the issue text.