Support advanced routing in google_compute_router

[vincepri]

BGP Peers now support CUSTOM advertise mode, which is documented here.

Custom mode allows to set advertisedGroups and advertisedIpRanges which are really useful when connecting to external providers and to allow route summarization.

[morgante]

Isn't this supported already? https://www.terraform.io/docs/providers/google/r/compute_router.html#advertised_ip_ranges

[danawillow]

Added in #1723

[ghost]

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