[META] Adding workloads for semantic search

[martin-gaievski]

This repo is missing workloads for semantic search. As this is large area I propose we start adding workloads incrementally to cover different aspects of semantic search: neural search, hybrid search, encoders, mutlimodal search, rerankers etc.

Following are individual items needed for semantic search:

• [FEATURE] Text based workload for semantic search #291
• [FEATURE] Workload for semantic search that has vector data and text fields #341