feat: add json to applications services

[esoubiran-aneo]

Simple to test implementation in Core

[esoubiran-aneo]

Currently grpc-ecosystem/grpc-gateway#1935

[esoubiran-aneo]

Il y a quelque chose à comprendre sur le path des fichiers proto pour ne pas avoir à les mettre sur la racine.

[Barbapapazes]

Si les essais sont concluants, alors il faudra un moyen de convertir les proto en type TS et de gérer 2 paquets npm

[CLAassistant]

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1 out of 2 committers have signed the CLA.

✅ aneojgurhem
❌ esoubiran-aneo
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