Add support for custom FE features

[azimov]

basically just lets temporalCovariateSettings to be a list where there first entry is required to be the default covariate settings object

[codecov[bot]]

Codecov Report

Merging #1003 (04dcf35) into develop (09bde2d) will increase coverage by 5.23%. The diff coverage is 88.87%.

:exclamation: Current head 04dcf35 differs from pull request most recent head 3eaa18c. Consider uploading reports for the commit 3eaa18c to get more accurate results

@@             Coverage Diff             @@
##           develop    #1003      +/-   ##
===========================================
+ Coverage    82.07%   87.31%   +5.23%     
===========================================
  Files           16       19       +3     
  Lines         3281     3919     +638     
===========================================
+ Hits          2693     3422     +729     
+ Misses         588      497      -91     

Impacted Files	Coverage Δ
R/Shiny.R	26.42% <32.74%> (-21.11%)	:arrow_down:
R/Shared.R	66.66% <66.66%> (ø)
R/Incremental.R	93.08% <78.94%> (+12.96%)	:arrow_up:
R/CohortRelationship.R	79.01% <79.01%> (ø)
R/DataSourceInformation.R	81.96% <81.96%> (ø)
R/CohortCharacterizationDiagnostics.R	82.08% <82.60%> (+6.19%)	:arrow_up:
R/ResultsDataModel.R	71.65% <86.56%> (-2.02%)	:arrow_down:
R/RunDiagnostics.R	89.73% <88.80%> (+9.70%)	:arrow_up:
R/Private.R	85.46% <92.64%> (+3.24%)	:arrow_up:
R/ConceptIds.R	97.29% <95.12%> (-0.35%)	:arrow_down:
... and 17 more

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