On the heels of Facebook taking a big step into customer service with the acquisition of Kustomer for $1 billion, another big move is afoot in the world of CRM. Sinch, a Swedish company that provides cloud-based “omnichannel” voice, video and messaging services to help enterprises communicate with customers, has announced that SoftBank is taking a $690 million stake in the company. Sinch said that it plans to use the proceeds of the share sale for M&A of its own. “We see clearly how our cloud-based platform helps businesses leverage…