Documentation for sparse vector compounds

[lusloher]

Documentation ticket

Once the five other Sparse vector pipeline tickets are completed, this ticket should then be attempted.

Acceptance Criteria

• This ticket is done when there is a new developer guide added to docs.jina.ai.

  • The guide should include an explanation of what sparse vectors are, citing some potential use cases for sparse vectors in a search system.

  • The guide should include a step-by-step tutorial for how to implement sparse vectors within the Jina system. Using this template.

[lusloher]

Link to subfeature: https://jinaai.productboard.com/feature-board/planning/features/7331522