Fix parameters separator for empty object case.

[samchon]

This pull request includes several changes to the @samchon/openapi package, focusing on schema composition and validation logic. The changes introduce new checks for empty objects and add new test cases to validate these changes.

Schema composition improvements:

• src/composers/llm/ChatGptSchemaComposer.ts: Added logic to handle empty objects in the separateParameters method. [1] [2]
• src/composers/llm/LlmSchemaV3Composer.ts: Added logic to handle empty objects in the separateParameters method. [1] [2]
• src/composers/llm/LlmSchemaV3_1Composer.ts: Added logic to handle empty objects in the separateParameters method. [1] [2]

Testing enhancements:

• test/features/llm/validate_llm_schema_separate_object_empty.ts: Added new test cases to validate the handling of empty objects in various schema versions.

Package version update:

• package.json: Updated the package version from 2.0.3 to 2.0.4.

[samchon]

OK