Add support for user-defined storage_context in llamaindex_knowledge …

[cmgzn]

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name: Add support for user-defined storage_context in llamaindex_knowledge and update knowledge config structure about: Create a pull request

Description

Added the ability for users to specify a custom storage_context. Refactored the knowledge_config structure to enhance readability and maintainability. Included an example configuration for ElasticsearchStore in knowledge_config.

Checklist

Please check the following items before code is ready to be reviewed.

• [x] Code has passed all tests
• [ ] Docstrings have been added/updated in Google Style
• [ ] Documentation has been updated
• [x] Code is ready for review