WIP: Implement backend for bitcoinsearch app

[ivssh]

• [x] Create routes for the search route
• [x] Add business logic to the controllers
• [ ] Write transformers for the response
• [x] Write tests (Optional)

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[Emmanuel-Develops]

How do we handle these couple of features:

• Pagination. query params? part of the request body?

• what of filters: I noticed we have an implementation that uses facets in the request body

  {
    "searchString": "bip "
    "facets": [
         {"field": "authors", "value": "pieter"}
      ]
  }

  The above implementation does work, but only for the "authors" field. Tags and domains don't.

• what of sorting?

Also, can we have docs for the API? it would be really helpful compared to looking through the code to find what is possible and what isn't.

cc: @adamjonas