Re-implement app as FastAPI

[willu47]

Complete reimplementation of the Research Index as a FastAPI web app closing #43 and #48

• Provides routes to a full OpenAPI at /api as well as recreating the website served over Flask.
• The api provides docs at /api/docs which provide detailed information about the data structures returned
• This release includes breaking changes, and requires use of the memgraph database provisioned by research_index_backend >= x.x

Other enhancements include:

• Pagination to HTML and API routes Add pagination to HTML views #53 using limit and skip parameters. Pagination is added to /outputs, /countries, /author/{id}, /country/{id}, basically wherever there are long lists, or outputs.
• Refactor of the CRUD/data models separating implementation of the queries to memgraph from the repackaging of the data to meet the requirements of the pydantic schema
• Consistent use of the CRUD/data models by all routes
• Improved consistency across the API and queries by re-using tempaltes for pagination, and outputs lists across web-pages