Chatbot Market Size and Forecast (2022 - 2031): Global and Regional Share, Trends, and Growth Opportunity Analysis by Offering (solution and services); by Type (standalone, web-based, messenger-based/third party); by Medium (contact centers, websites, social media, and mobile applications); by Business Function (IT Services, HR Services, Sales & Marketing, and Finance); by Application (Customer Services, Branding & Advertising, Personal Assistance, Data Privacy & Compliance, Payment Processing, and Others); Vertical (Healthcare, Retail & E-commerce, BFSI, Media & Entertainment, Travel & Tourism, Transportation & Logistics, and Others); by Region (North America, Europe, Asia-Pacific, Latin America, and Middle East & Africa)