Validate coordonneesXY statique data field

[jmaupetit]

Purpose

If we want to be able to query data from a particular geometry, we need to have relevant charging station position. In this case, checking coordonneesXY validity seems relevant.

Proposal

Given a postal code or a code_insee_commune (is it french-specific?) validate that station's location is included in the related polygon.

[jmaupetit]

Enforce coordonneesXY validation in the model would be too costly has we need to get related polygon (given a code_insee_commune) from the database. We need to find a way to post validate efficiently submitted statique data.