Sync refactors from latest Notion public OpenAPI schema

[ksinder]

This PR syncs the latest changes from Notion's public OpenAPI schema into src/api-endpoints.ts.

• Most of the changes are no-op refactors, extracting existing types into more granular request and response shapes, e.g. GroupObjectResponse, InternalFileResponse, and FilePageIconResponse are separate variables.
• Add support to the oauth/token endpoint for refreshing.
  • Specifically, OauthTokenBodyParameters has a new variant of parameter shape that is supported: { grant_type: "refresh_token"; refresh_token: string }

[Copilot]

Pull Request Overview

This PR syncs refactors from Notion's public OpenAPI schema to improve type granularity and add OAuth refresh token support. Most changes extract inline type definitions into reusable named types for better maintainability.

• Extract common type patterns like InternalFileResponse, ContentWithRichTextAndColorResponse, and GroupObjectResponse into reusable types
• Add support for OAuth refresh token flow in addition to authorization code flow
• Update language options list with new Java variant and alphabetical reordering