Write a SpacetimeDB backend module in TypeScript that demonstrates product types (structs) used in tables.

TYPES
- Score
  - left: number (i32)
  - right: number (i32)

TABLE
- result
  - Fields:
    - id: number (i32, primary key)
    - value: Score

REDUCERS
- setScore: given id:number, left:number, right:number, insert row with value=Score{left, right}
