Use dsbuild as inspiration for emitting plv8 Javascript from Typescript

[shah]

PL/v8 (docs) is a library that allows users to write PostgreSQL stored procedures, functions, triggers, and other code in Javascript. However, we want to write type-safe TypeScript code and have that transpiled to Javascript.

Use dsbuild directly as a module or use it for inspiration so that we can create PostgreSQL stored routines using SQLa-wrapped TypeScript and emit PL/v8-friendly JavaScript that can be directly loaded into PostgreSQL.

See related #114