Introduce a GBFS Validator API product offering

[AntoineAugusti]

People have expressed the desire to use the GBFS Validator through an HTTP API (#53 #95 at least). At the moment it's possible but it's hidden and it's not a proper feature offered by MobilityData.

As discussed during the recent workshop in Valencia, Spain it would be great to:

• clarify that there is an API available
• define terms of services/restrictions/support/pricing (if applicable)
• write a documentation
• make sure HTTP responses are stable over time to avoid breaking integrations

We @ transport.data.gouv.fr rely on this hidden API every day at the moment and are more than happy to help you review these things.

[PierrickP]

Hello,

Yes, it's a good idea ! (as it's already used externaly ;) )

ℹ️ If you don't know, we already expose an OpenAPI endpoint on https://gbfs-validator.mobilitydata.org/.netlify/functions/doc

If we want to offer a real API product, the current hosting on netlify may be limited ( .netlify on the path, timeout execution, max body size #109, etc)

[richfab]

Related PR: #171