Add spec violation rules

[richfab]

This PR follows https://github.com/MobilityData/gbfs-validator/pull/106.

1. Brings all the code from https://github.com/MobilityData/gbfs-validator/pull/106.
2. Removes the validation rules that are not in the spec, as agreed in https://github.com/MobilityData/gbfs-validator/pull/106#issuecomment-1728467525. The code removed can be found in https://github.com/MobilityData/gbfs-validator/pull/139.
3. Collapses errors and warnings in the UI (they were expanded by default in https://github.com/MobilityData/gbfs-validator/pull/106)

Before	After

Feed used for screenshots: https://acoruna.publicbikesystem.net/customer/gbfs/v2/gbfs.json

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[testower]

One thing I should add in my quest for schema-centric validation is of course that the SHOULD/warning validations are hard to implement that way...

[richfab]

@testower I'm done applying the quick fixes from your suggestions. The other comments are beyond my technical knowledge. I will sync with @davidgamez about next steps. Thanks!

[richfab]

Thank you @tdelmas for the initial PR (https://github.com/MobilityData/gbfs-validator/pull/106) and @testower for the thorough PR review.

Based on the conversation following https://github.com/MobilityData/gbfs-validator/issues/153#issuecomment-1806145023, we want to try doing the validation of these new rules by generating new schemas via a builder or a template instead of using imperative rules (eg: JavaScript).

For this reason, I believe this PR can be closed in favor of the following issues:

• https://github.com/MobilityData/gbfs-validator/issues/153
• https://github.com/MobilityData/gbfs-validator/issues/154
• https://github.com/MobilityData/gbfs-validator/issues/155
• https://github.com/MobilityData/gbfs-validator/issues/156

Thank you!