[web-db] not include crypto, fs, and path polyfills for workers

Summary:
Docs: webpack.

Without this change including sql,js module in worker will cause issues with module not found.

Depends on D6987

Test Plan: cd web && yarn dev

Reviewers: michal, tomek, ashoat

Reviewed By: ashoat

Subscribers: ashoat, atul

Differential Revision: https://phab.comm.dev/D6988