ICD-10 API: score based ranking + filtering of matches

[andreakreichgauer]

🚀 Describe the Improvement

As a user, I'd like to have a convenient trade off between getting a narrow list of matches, but also getting a complete list of relevant results.
Therefore the API should not only search for matches, but also perform a kind scoring, which can be used for ranking (and filtering) results.

Example: A user enters the term "idiopathic parkinson syndrom".
Only the combinations of "idiopathic AND parkinson" and "syndrom AND parkinson" should lead to relevant results.
Nevertheless, the combination of "idiopathic AND syndrom" will also lead to a huge number of matches, that blur the overall result.

Therefore, scoring of matches should take into account, if (combinations of) search terms seem to be too generic, to be considered as matches.

✔ Goals

To complete this story, these things have to be done:

• implement scoring (based on fuse.js fuzzy score and custom scoring)
• implement custom score, considering if term is too generic
• rank results based on score
• filter results (e.g. based on threshold) if results seems to be too wide