Add support for routingMode in google_compute_network

[wallies]

This is part of the V1 API

Cloud Router dynamically advertises subnets and propagates learned routes in the region where the router is configured or throughout the entire VPC network.

Whether Cloud Routers in a VPC network are regional or global, depends on the VPC network's dynamic routing mode. When creating or editing a VPC network, you can set the dynamic routing mode to be regional or global.

[danawillow]

@emilymye

[ghost]

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