Dataset timestamp col mapping

[Jami159]

For calibrate, in order to know which dataset column has timestamp, we're going to require the request body to have a mapping from the dataset column name to the 'timestamp' string. So for example the request body may look like

{
...
  "mappings": {
    <dataset timestamp column name:: "timestamp",
    <dataset column name 1>: <model state var 1>,
    <dataset column name 2>: <model state var 2>,
    ...
  }
...
}

[codecov-commenter]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (7400ab4) 78.06% compared to head (65507dc) 77.56%.

Files	Patch %	Lines
src/SimulationService.jl	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #149      +/-   ##
==========================================
- Coverage   78.06%   77.56%   -0.51%     
==========================================
  Files           3        3              
  Lines         465      468       +3     
==========================================
  Hits          363      363              
- Misses        102      105       +3     

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[jClugstor]

Looks good!