Fix Extended Birth Date in CQL

[alexanderkiel]

For age calculation in CQL, the property birthDate.value is used. That .value part means that we have to get the value of the FHIR date type. We never did this and so got ExtendedDate into the CQL evaluation which doesn't work.

Also overhauled the System.Date and System.DateTime types. Decided to implement them in Java. Improved the parsing performance by about 4 times. For Date/DateTime up to Date precision.

Closes: #973

[codecov]

Codecov Report

Merging #985 (3ece5a7) into develop (2f82a0e) will increase coverage by 0.02%.
The diff coverage is 94.21%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #985      +/-   ##
===========================================
+ Coverage    94.13%   94.16%   +0.02%     
===========================================
  Files          238      238              
  Lines        15237    15107     -130     
  Branches       379      374       -5     
===========================================
- Hits         14343    14225     -118     
+ Misses         515      508       -7     
+ Partials       379      374       -5     

Impacted Files	Coverage Δ
modules/cql/src/blaze/elm/protocols.clj	100.00% <ø> (ø)
...s/cql/src/blaze/elm/compiler/structured_values.clj	77.10% <76.19%> (+0.29%)	⬆️
modules/cql/src/blaze/elm/date_time.clj	93.23% <91.48%> (-0.53%)	⬇️
...fhir-structure/src/blaze/fhir/spec/type/system.clj	96.76% <95.61%> (+3.76%)	⬆️
modules/anomaly/src/blaze/anomaly.clj	100.00% <100.00%> (ø)
modules/anomaly/src/blaze/anomaly_spec.clj	100.00% <100.00%> (ø)
.../cql/src/blaze/elm/compiler/clinical_operators.clj	100.00% <100.00%> (ø)
...cql/src/blaze/elm/compiler/date_time_operators.clj	75.40% <100.00%> (-2.49%)	⬇️
...dules/cql/src/blaze/elm/compiler/reusing_logic.clj	85.26% <100.00%> (+2.46%)	⬆️
modules/cql/src/blaze/elm/decimal.clj	99.09% <100.00%> (-0.06%)	⬇️
... and 4 more