[web-db] Use unique filename for each prod sql-wasm.wasm asset

Summary:
ENG-3329

• adding contenthash to sql.js asset file
• adding mafiest plugin

Test Plan: Run in dev and prod modes, check if worker can access and use file

Reviewers: michal, atul

Reviewed By: michal

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D7092