fix: align models with current IGDB schema

[TDanks2000]

What

• add the documented image_types endpoint and typed imageTypes client property
• add ImageType and current image_type / game_localization image fields
• align company size/history fields with the current Company schema
• correct scalar/reference types for Game Time To Beat, popularity, and release-region fields
• add currently documented Region and Network Type fields
• document the new endpoint
• add a patch changeset

Why

The wrapper had drifted from the current IGDB v4 schema. In particular, image_types was missing entirely and several model properties either omitted current fields or represented scalar IDs/deprecated enum fields as reference objects.

Official references used for the audit:

• https://api-docs.igdb.com/
• https://api.igdb.com/v4/igdbapi.proto

Impact

Improves endpoint coverage and TypeScript accuracy for current IGDB responses. Deprecated fields that IGDB still documents during its migration remain available; stale fields no longer present on the current Company schema are removed.

Checks

• compared branch against main for scope
• current IGDB docs and protobuf checked field-by-field for the changed models
• local bun run check was not available in the connector-only environment; CI should be treated as the executable verification