NEW YORK — WeWork has filed for Chapter 11 bankruptcy protection, marking a stunning fall for the office sharing company once seen as a Wall Street darling that promised to upend the way people went to work around the world.The New York company said late Monday that it had entered into a restructuring agreement with most of its stakeholders aimed at slashing its debt, while it looks to trim its commercial office lease portfolio.The agreement is expected to erase about $3 billion of WeWork’s debt, CEO David …