fix: updated methods to match docs

[DaniAkash]

This pull request introduces several changes to the project, primarily focusing on the src/client/model.ts file and the test suite. The changes include the addition of a new dependency, modifications to the Dataset and Model classes, a change to the default search metric, and the addition of new test cases.

Dependency Changes:

• package.json: Added axios as a new dependency to the project.

Modifications to Classes:

• src/client/dataset.ts: Made the labels parameter optional in the Dataset class.
• src/client/model.ts: Made several changes to the Model class, including modifying the BaseModelConfig and ModelConfigWithModelId interfaces to allow for modelUserAppId, and adding new conditions and error handling for url and modelUserAppId. The Model class constructor was also updated to handle authConfigFromUrl and modelUserAppId differently. [1] [2] [3]

Search Metric Change:

• src/constants/search.ts: Changed the default search metric from cosine to euclidean.

Test Suite Improvements:

• tests/client/model.integration.test.ts: Added several new test cases to the model integration test suite.
• tests/client/rag.integration.test.ts: Increased the timeout for a test case in the Rag integration test suite.