Added bal schema to address, common toponym and district meta schemas

[antoineludeau]

I. Context

In order to complete our new data schema with the BAL data, we need to store some extra information.

II. Enhancements

This PR aims to add in the new address, common toponym and district schemas the "bal" meta schema (optional field) that will store the following data :

• idRevision <= data from "API de dépôt"
• dateRevision <= data from "API de dépôt"
• codeAncienneCommune <= field commune_deleguee_insee in BAL format,
• nomAncienneCommune <= field commune_deleguee_nom in BAL format,
• isLieuDit <= if number === 99999

III. How to test

1- Post an an address, a common toponym or a district with the following meta :

"meta": {
"bal":{
"idRevision":"ID_TEST",
"dateRevision":"DATE_TEST",
"codeAncienneCommune": "CODE_ANCIENNE_COMMUNE_TEST",
"nomAncienneCommune": "NOM_ANCIENNE_COMMUNE_TEST",
"isLieuDit": true
}