Implement Azure Hit Highlighting in Semantic Search in azure-db

[k-allagbe]

Integrate Azure's hit highlighting to improve user experience and relevance in our semantic search system.

Rationale

• Facilitates quicker identification of relevant information by visually marking matching search terms.
• Highlights and focuses on the most pertinent parts of texts related to the search query instead of returning the whole content.

Tasks

• Implement Azure's hit highlighting into our search results.
• Configurable highlighting style.
• Tests.

Acceptance Criteria

• Search results include relevant snippets.