44 validation error if resource doesnt exist

[Wauplin]

Closes #44 .

• Raise a pydantic.ValidationError if resourceType is not provided in from_dict method.
• resource_type attribute is now a typing.Literal, not str

[codecov[bot]]

Codecov Report

Merging #48 into master will increase coverage by 0.09%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #48      +/-   ##
==========================================
+ Coverage   81.36%   81.46%   +0.09%     
==========================================
  Files          11       11              
  Lines        1229     1230       +1     
==========================================
+ Hits         1000     1002       +2     
+ Misses        229      228       -1     

Flag	Coverage Δ
#unittests	81.46% <100.00%> (+0.09%)	:arrow_up:

Impacted Files	Coverage Δ
fhirzeug/fhirrenderer.py	83.69% <100.00%> (+1.27%)	:arrow_up:

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