feat: check station_information and station_status for corresponding station ids

[hbruch]

This PR adds a "foreign key" reference check for station_information' and station_status' station_ids.

Besides the addition of rule NoInvalidReferenceToStation it fixes test fixtures which had inconsistent station_ids in their station_information and station_status feeds.

Motivation

The GBFS spec for versions greater or equal to v2.1 says:

Any station that is represented in station_status.json MUST have a corresponding entry in station_information.json.
and
Any station that is represented in station_information.json MUST have a corresponding entry in station_status.json.

Note: This PR includes this check for v2.2, v.2.3 and v3.0. If you agree with the implementation, I'd add it for v2.1 as well. v2.0 had this requirement not yet clearly spelled out, so I'd not add the validation for <=2.0.

[CLAassistant]

All committers have signed the CLA.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[hbruch]

Thanks for reviewing. I added validation for v.2.1. From my side, this PR is now ready to merge.