Make Compatible with Directus Client SDK

Thank you michael-scheurer for testing.

Fixes #1

Generate into single file

Due to many different build systems using different types of imports I decided to generate all models into a single file instead. This also reduces the number of imports needed when using the generated types.

Add support for dropdown or choice fields

Whenever you add choices to a field (such as a dropdown) the types will reflect these choices.

Initial Release

The first release of this extension. It includes support for all common types except geometry.