[#369] Monthly Timespan Fact

[Vynny]

[#369]

• [X] Integrated the tenant_not_paid_lease_timespan fact into NLP service. Typically asked during nonpayment cases.
• [X] Added the DURATION_MONTHS FactType.
• [X] Added entity extraction support for DURATION_MONTHS to fact_service. Will attempt to coerce the value if given weeks or days. Value always rounds up, thus 6 weeks = 2 months, etc.
• [X] Changed a few sentences to make them sound a bit more natural.
• [X] Added succinct fact descriptions to all current facts.
• [X] Fixed an error in ML wherein the wrong bin was being downloaded on init.

Note: This requires a database reset to function correctly.

[codecov[bot]]

Codecov Report

Merging #421 into master will decrease coverage by 0.02%. The diff coverage is 68.18%.

@@            Coverage Diff             @@
##           master     #421      +/-   ##
==========================================
- Coverage    70.9%   70.88%   -0.03%     
==========================================
  Files          54       54              
  Lines        2251     2270      +19     
  Branches       23       23              
==========================================
+ Hits         1596     1609      +13     
- Misses        654      660       +6     
  Partials        1        1

Impacted Files	Coverage Δ
src/ml_service/init.py	74.07% <ø> (ø)	:arrow_up:
src/nlp_service/init_rasa.py	0% <ø> (ø)	:arrow_up:
src/nlp_service/services/response_strings.py	100% <ø> (ø)	:arrow_up:
src/nlp_service/controllers/nlp_controller.py	0% <0%> (ø)	:arrow_up:
src/ml_service/init_test.py	100% <100%> (ø)	:arrow_up:
src/nlp_service/services/fact_service.py	96.46% <76.47%> (-3.54%)	:arrow_down:

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