The world’s best-performing IPO stock this year is a little known Indonesian coal mining company that’s backed by one of Southeast Asia’s richest men. PT Petrindo Jaya Kreasi has soared more than 2,900% since it listed in March following a $25 million offering. Yet it still has no analyst coverage, is richly valued and has relatively low trading volumes. Counting Indonesian billionaire Prajogo Pangestu as its main shareholder, the company’s market value has grown by more than 25 times to $5.4 billion in just…