Fix simulation with data and add tests.

[janosg]

Current behavior

Simulation with data leads to an error

Solution / Implementation

Convert categorical columns to numerical values where necessary.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@03f9a98). Click here to learn what that means.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #383   +/-   ##
=======================================
  Coverage        ?   86.01%           
=======================================
  Files           ?       48           
  Lines           ?     3426           
  Branches        ?        0           
=======================================
  Hits            ?     2947           
  Misses          ?      479           
  Partials        ?        0           

Flag	Coverage Δ
#end_to_end	75.27% <100.00%> (?)
#integration	65.38% <46.15%> (?)
#unit	69.84% <46.15%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
respy/simulate.py	95.12% <100.00%> (ø)
respy/tests/test_simulate.py	100.00% <100.00%> (ø)

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