don't default to addtional properties in schemas

[shakyShane]

https://app.asana.com/0/1201614831475344/1207053312757015/f

TL;DR

This PR restricts additional properties in the build-types script.

What changed?

The createTypesForSchemaFile and createTypesForSchemaMessages functions in build-types.mjs now include the additionalProperties: false option.

Why make this change?

The library that generates the types makes open-ended objects by default by adding the index signature.

without this change, it's really tedious to create schemas since every top-level and nested object requires you to put "additonalProperties": false

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[shakyShane]

• adding boundary types for pir #953
• don't default to addtional properties in schemas #952 👈
• main

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[shakyShane]

@jonathanKingston just a QOL thing, I noticed whilst trying to add types for PIR that this was a pain.