[feature] drop vj without growing stop times

[woshilapin]

Remove the vehicle journey if the stop times don't have ordered departure_time/arrival_time.

ref: ND-1672

[woshilapin]

@woshilapin Note that the production of incorrect ntfs will always be possible. There we correct the reading (and the following productions). Are we okay?

I moved everything to Model::new() and added some tests. However, there is a weirdness with multiple versions of transit_model, I'll try to see if I can improve it.

[woshilapin]

I added some assertions on the logs in c72c257 and moved some tests to a better place in 564aca2 (in the same place where the function sort_and_check_stop_times is implemented).

[woshilapin]

I removed the transmute trick because it's really just a trick and not really nice (see 52142e0).

[woshilapin]

I added @prhod as a reviewer for the documentation part.