Added GetVisitConcept getter function

[TheCedarPrince]

This function gets the visit concept ID associated with a given visit occurrence. A bit small but can be helpful in a functional sense.

[codecov[bot]]

Codecov Report

Merging #41 (baea6eb) into dev (5341bca) will decrease coverage by 2.67%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##              dev      #41      +/-   ##
==========================================
- Coverage   70.78%   68.10%   -2.68%     
==========================================
  Files           5        5              
  Lines         178      185       +7     
==========================================
  Hits          126      126              
- Misses         52       59       +7     

Impacted Files	Coverage Δ
src/getters.jl	78.35% <0.00%> (-6.10%)	:arrow_down:

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