Cloud Billing Market By Component (Solution, Services), By Billing Type (Subscription, Usage Based, One-Time, Others), By Deployment Type (Private Cloud, Public Cloud, Hybrid Cloud), By Service Model (IaaS, PaaS, SaaS), By Enterprise Size (Large Enterprises, Small and Medium-sized Enterprises), By Industry Vertical (BFSI, IT and Telecommunication, Education, Construction, Media and Entertainment, Healthcare, Others): Global Opportunity Analysis and Industry Forecast, 2021-2031