[REQUEST] Add Perplexity search endpoint

[drewbitt]

trafficstars

Is your feature request related to a problem? Please describe. Add Perplexity Search endpoint so the user has another option like Tavily/Exa for quality searches

Describe the solution you'd like Add the perplexity search endpoint. Currently the Perplexity block only supports the /chat/completions endpoint.

Additional context Endpoint details https://docs.perplexity.ai/api-reference/search-post https://docs.perplexity.ai/getting-started/pricing#choosing-the-right-api