chore: type generation fixes + improvements

[ChiragAgg5k]

What does this PR do?

• (CLI SDK) Type generation fixes:
  • Dart: Fixed import casing to snake_case, removed extends Document and hardcoded attributes, removed unnecessary imports
  • Java: Fixed indentation to 4 spaces, updated imports to java.util.Objects, fixed enum casing in strict mode as per Oracle official docs
  • Javascript: Updated optional values formatting from |null to | null
  • Kotlin: Fixed indentation to 4 spaces per Kotlinlang official docs
  • PHP: Fixed indentation to 4 spaces per PHP Fig official docs
  • Swift: Fixed indentation to 4 spaces, improved decodeIfPresent usage for optionals, added missing public to init method
  • Typescript: Fixed indentation to 4 spaces per Typescript coding guidelines
• (Dart SDK) Fixed toConvert() method return type to Map<String, dynamic>

Test Plan

Related PRs and Issues

Have you read the Contributing Guidelines on issues?

yes

[Copilot]

Pull Request Overview

This PR focuses on fixing and improving type generation for multiple SDKs across different programming languages. The changes address formatting, indentation, typing, and code generation issues to align with official language standards and best practices.

• Fix type generation issues across Dart, Java, Swift, TypeScript, and other language SDKs
• Improve code formatting and indentation to match official language guidelines
• Remove unnecessary imports and hardcoded attributes from generated types

Reviewed Changes

Copilot reviewed 5 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
templates/dart/lib/src/models/model.dart.twig	Fix generic type parameter to use proper Map typing
templates/cli/lib/type-generation/languages/typescript.js.twig	Fix collection iteration and template formatting
templates/cli/lib/type-generation/languages/swift.js.twig	Add public visibility to init method and fix optional value decoding logic
templates/cli/lib/type-generation/languages/java.js.twig	Fix enum casing, toString method formatting, and import specificity
templates/cli/lib/type-generation/languages/dart.js.twig	Remove Document inheritance, fix import casing, and clean up hardcoded attributes