[#186] NLP Integration of retaking rental + some fixes

[Vynny]

[#186]

• [X] Adds retaking rental claim category and training data for its classification
• [X] Reworked the way predictions are given. All claim categories now have at least 1 outcome that must be returned, whether true or false. Any additional non zero outcomes that are predicted will also be displayed.
• [X] Fixes a bug wherein getting a FAQ question would crash NLP

[codecov[bot]]

Codecov Report

Merging #389 into master will decrease coverage by 0.03%. The diff coverage is 68.42%.

@@            Coverage Diff             @@
##           master     #389      +/-   ##
==========================================
- Coverage   68.21%   68.17%   -0.04%     
==========================================
  Files          51       51              
  Lines        2095     2099       +4     
  Branches       17       17              
==========================================
+ Hits         1429     1431       +2     
- Misses        661      663       +2     
  Partials        5        5

Impacted Files	Coverage Δ
src/nlp_service/services/fact_service.py	100% <ø> (ø)	:arrow_up:
src/nlp_service/controllers/nlp_controller.py	0% <0%> (ø)	:arrow_up:
src/ml_service/init.py	74.07% <0%> (ø)	:arrow_up:
src/nlp_service/services/ml_service.py	83.58% <100%> (+0.5%)	:arrow_up:
src/nlp_service/services/response_strings.py	100% <100%> (ø)	:arrow_up:

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