What are the top oil and gas storage companies in India that operate major tank farms and terminal infrastructure supporting petroleum, LNG, and chemical storage, how do companies such as Indian Strategic Petroleum Reserves Limited (ISPRL), Aegis Logistics (Aegis Vopak Terminals), Petronet LNG, IOT Infrastructure & Energy Services, and Gulf Petrochem compare in terms of storage capacity, terminal locations, and logistics capabilities, and what important factors should businesses consider when choosing a reliable oil and gas storage terminal operator in India?