Missing AWS::AppMesh types

[corymhall]

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Issue details

### Tasks
- [ ] AWS::AppMesh::GatewayRoute
- [ ] AWS::AppMesh::Mesh
- [ ] AWS::AppMesh::Route
- [ ] AWS::AppMesh::VirtualGateway
- [ ] AWS::AppMesh::VirtualNode
- [ ] AWS::AppMesh::VirtualRouter
- [ ] AWS::AppMesh::VirtualService

Affected area/feature