Added OpenSearch

[ftisiot]

Summary

Added OpenSearch to vector databases Example

Motivation

OpenSearch was missing from vector databases, this PR fixes it with an example

---

For new content

When contributing new content, read through our contribution guidelines, and mark the following action items as completed:

• [X] I have added a new entry in registry.yaml (and, optionally, in authors.yaml) so that my content renders on the cookbook website.
• [X] I have conducted a self-review of my content based on the contribution guidelines:
  • [X] Relevance: This content is related to building with OpenAI technologies and is useful to others.
  • [X] Uniqueness: I have searched for related examples in the OpenAI Cookbook, and verified that my content offers new insights or unique information compared to existing documentation.
  • [X] Spelling and Grammar: I have checked for spelling or grammatical mistakes.
  • [X] Clarity: I have done a final read-through and verified that my submission is well-organized and easy to understand.
  • [X] Correctness: The information I include is correct and all of my code executes successfully.
  • [X] Completeness: I have explained everything fully, including all necessary references and citations.

We will rate each of these areas on a scale from 1 to 4, and will only accept contributions that score 3 or higher on all areas. Refer to our contribution guidelines for more details.