🚀 feat: Support multiple Azure AI Search indexes and enhance search functionality

[rubentalstra]

Summary

Closes: #3862

This pull request includes significant updates to the AzureAISearch class in the api/app/clients/tools/structured/AzureAISearch.js file. The changes enhance the functionality to support multiple search indexes and improve error handling.

Enhancements to support multiple search indexes:

• Changed the initialization of indexName to indexNames to handle multiple indexes as a comma-separated string.
• Updated the required fields check to validate indexNames instead of indexName.
• Modified the client creation process to support multiple indexes by splitting indexNames, trimming whitespace, converting to lowercase, and filtering out empty strings. Created a client for each valid index.

Improvements in error handling and search functionality:

• Enhanced the search functionality to query all indexes concurrently and flatten the results from all indexes before returning them as a combined JSON string.

Change Type

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Testing

Please describe your test process and include instructions so that we can reproduce your test. If there are any important variables for your testing configuration, list them here.

Test Configuration:

Checklist

• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• I have commented in any complex areas of my code
• I have made pertinent documentation changes
• My changes do not introduce new warnings
• I have written tests demonstrating that my changes are effective or that my feature works
• Local unit tests pass with my changes
• Any changes dependent on mine have been merged and published in downstream modules.
• A pull request for updating the documentation has been submitted.