Add Router resource for edgenetwork API

[f1urps]

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Description

Add support for the following resources for edgenetwork API:

• router

The router resource depends on the subnet resource and interconnectAttachment resource, so #15664 and #15665 should be completed first.

New or Affected Resource(s)

• google_edgenetwork_router

References

• This is part of: Add support for edgenetwork API #15636

b/298278262

[f1urps]

I will work on this.