Incomplete first pass of underpass new infrastructure

[dakotabenjamin]

DO NOT MERGE

I wanted to put out some progress and outline some blockers I still need to address before we can say its in a deployable state:

• @eternaltyro for the peering connection, i need a little guidance on setting the cidr_block param. should that come from the vpc module or be defined internally?
• the major incomplete part is the api ECS. plan is to use this module: https://gitlab.com/eternaltyro/terraform-aws-ecs
• should we update the route53 zone to underpass.hotosm.org?
• there were 2 file processor blocks. idk why
• there are few todo's ive added for random things, as well as todos from before

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