Remove extension-functions.c from web assembly and add JS polyfills

[AnyhowStep]

The extension-functions.c comes from,
https://www.sqlite.org/contrib?orderby=date

The problem with these extension functions is that they are marked as non-deterministic.

However, sqrt() is a deterministic function.

[AnyhowStep]

Well, the other alternative is to modify extension-functions.c and make the functions deterministic