[FEA]: Create Haystack LLM Node

[mdemoret-nv]

Is this a new feature, an improvement, or a change to existing functionality?

New Feature

How would you describe the priority of this feature request

Critical (currently preventing usage)

Please provide a clear description of problem this feature solves

To support using Haystack functionality directly in the the LLM Engine from #1178, a Haystack Prompt Generator should be created. This will allow quick prototyping with LLMs in Morpheus by supporting existing complex functionality from the Haystack library. The focus here is on ease of use and not performance.

Describe your ideal solution

This Prompt Generator will directly wrap components from the Haystack library. Its primary functionality will be translating between Morpheus and Haystack concepts.

Describe any alternatives you have considered

No response

Additional context

No response

Code of Conduct

• I agree to follow this project's Code of Conduct
• I have searched the open feature requests and have found no duplicates for this feature request