Generative AI Chatbot Market Size, Share & Industry Analysis, By Deployment (On-premise and Cloud), By Technology (Natural Language Processing, Machine Learning and Deep Learning, Automatic Speech Recognition, and Others), By Business Function (Sales & Marketing, Supply Chain & Operations, Finance & Accounting, Human Resource, and IT Service Management), By Industry (BFSI, IT & Telecom, Retail & e-Commerce, Healthcare, Government & Public Sector, Media & Entertainment, Education, and Others), and Regional Forecast, 2026-2034