release-3.0.0

What's Changed

• chore: different improvements by @mikita-kandratsyeu in #65
• feat: added GigaChat API and switcher between OpenAI by @mikita-kandratsyeu in #66
• feat: add new client's auth by @mikita-kandratsyeu in #74
• feat: refactor AI according new API by @mikita-kandratsyeu in #75
• feat: refactor Client for GPT with DB by @mikita-kandratsyeu in #76
• feat: client's feedback functionality by @mikita-kandratsyeu in #77
• feat: add Generator for images by @mikita-kandratsyeu in #78
• feat: voice speech from Sber by @mikita-kandratsyeu in #79
• feat: add mailing for Clients by @mikita-kandratsyeu in #80
• chore: promo rate by @mikita-kandratsyeu in #81
• chore: logger by @mikita-kandratsyeu in #83

Full Changelog: 2.0.3...3.0.0