support search mode param from pplx

[narengogi]

Title:

• Brief Description of Changes

Description:

🔄 What Changed

• Added a new parameter web_search_options to the PerplexityAIChatCompleteConfig configuration.

🔍 Impact of the Change

• This change allows for more flexible search options when interacting with the Perplexity AI service, potentially improving user experience by providing additional search capabilities.

📁 Total Files Changed

• 1 file modified: src/providers/perplexity-ai/chatComplete.ts

🧪 Test Added

• N/A

🔒 Security Vulnerabilities

• N/A