Add second continuous state variable

[segsell]

Allow for a second continuous state variable besides wealth (such as continuous experience).

[codecov]

Codecov Report

Attention: Patch coverage is 98.53480% with 4 lines in your changes missing coverage. Please review.

Project coverage is 96.69%. Comparing base (0eaca69) to head (6240f15).

Files with missing lines	Patch %	Lines
src/dcegm/simulation/sim_utils.py	91.66%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #118      +/-   ##
==========================================
- Coverage   97.10%   96.69%   -0.42%     
==========================================
  Files          23       24       +1     
  Lines         865     1059     +194     
==========================================
+ Hits          840     1024     +184     
- Misses         25       35      +10     

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