Add INFO notice for long trip_ids

[skalexch]

Describe the problem

Multiple community members support adding a recommendation on the length of trip_id (Issue#518).

While the conversation is still ongoing, it would be nice if we add an INFO alert when the trip_id exceeds a certain threshold.
The current threshold can be chosen based on empirical values. Using the latest GTFS datasets we have in the Mobility Database, we look at the outliers. Based on the 95th percentiles values of the Median length and Max length of trip_ids in GTFS feeds, we can choose a value like THRESHOLD = 40. We can also be a bit nifty and choose THRESHOLD = 32, but it will flag more trip_ids.

If the recommendation is adopted in the spec, we can then:

• Upgrade the notice to a WARNING.
• Change the threshold based on what the community agreed on.

Describe the new validation rule

If any trip_id > THRESHOLD → Raise INFO notice.

Sample GTFS datasets

No response

Severity

INFO

Additional context

No response