Create APIs for address risk

[elucherini]

Context

For the MVP, we need to support this user flow:

1. User searches an address through search box.
2. User gets back risk(s) for that address.

This is the backend issue for this user flow. We should also open a corresponding frontend issue, if it doesn't already exist.

Definition of Done

Three APIs with related tests:

• API that, given an address, tells whether it is a soft story
• API that, given an address, tells whether it is in a liquefaction seismic zone
• API that, given an address, tells whether it is in a zone at risk of tsunami

Translating the address obtained through MapBox autocomplete into a geometrical Point could be handled by the frontend (so we keep all MapBox-related stuff in the frontend), so it is currently out of scope for this issue.

Engineering Details

All these APIs are GET requests that take latitude and longitude as input. The exact output should be further discussed with the frontend team. For now, all APIs return a simple boolean.