Add validation of segments when writing a `MultiRecord`

As mentioned in #555, when writing multisegment records we should validate the segments. A good initial step would be to simply add the already developed _check_segment_cohesion validation to the workflow.

There are likely a number of other validations that should be performed. For example, we may want to confirm that samps_per_frame is set for segments with expanded signals and that their length is as expected.

Please add any additional suggestions for validating the segments below.

L’issue ne mentionne ni fichier ni test ; commencez par suivre le workflow d’écriture de MultiRecord et localiser la validation existante _check_segment_cohesion. Utilisez #555 et la validation actuelle comme contexte, puis confirmez quelles vérifications supplémentaires des segments sont dans le périmètre et quels critères d’achèvement devraient être appliqués.