feat: Added technical schemas from whimsical

Related to #15 (closed)

La doc a changé pour les connecteurs gaz + elec

Avec les schémas whimsical :

• gaz : https://whimsical.com/grdf-tech-3jhKdqn7gG7dhbbvykQHJS@2bsEvpTYSt1Hj1h5bR3v7ZSV4TLaeBg49f3
• mail du gaz : https://whimsical.com/grdf-tech-3jhKdqn7gG7dhbbvykQHJS@2bsEvpTYSt1HiwcPgcd3oz1KMULPHLiqSed
• elec : https://whimsical.com/sge-tech-Mo8axc4RMP2CSqyQMZ7zyq@2bsEvpTYSt1HjB8j1zahn389J4nuKkpSnu4
• elec verifyUserIdentity : https://whimsical.com/sge-tech-Mo8axc4RMP2CSqyQMZ7zyq@2bsEvpTYSt1HjGz9ayebT9pnTdaEMVTNw16