Add Solver::get_current_time

[dweindl]

... to get the current integration time from the solver.

(also fixes a couple of incorrect exception types and messages)

Prerequisite for #2246.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 18 lines in your changes are missing coverage. Please review.

Project coverage is 77.81%. Comparing base (e8852be) to head (fac4795).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2346      +/-   ##
===========================================
- Coverage    77.88%   77.81%   -0.07%     
===========================================
  Files          324      324              
  Lines        20731    20745      +14     
  Branches      1449     1453       +4     
===========================================
- Hits         16146    16143       -3     
- Misses        4582     4599      +17     
  Partials         3        3              

Flag	Coverage Δ
cpp	73.61% <0.00%> (-0.07%)	⬇️
cpp_python	34.32% <0.00%> (-0.03%)	⬇️
petab	36.82% <0.00%> (-0.04%)	⬇️
python	72.39% <0.00%> (-0.06%)	⬇️
sbmlsuite	?

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

Files	Coverage Δ
include/amici/solver.h	100.00% <ø> (ø)
include/amici/solver_cvodes.h	100.00% <ø> (ø)
include/amici/solver_idas.h	100.00% <ø> (ø)
src/solver_cvodes.cpp	69.01% <0.00%> (-0.51%)	⬇️
src/solver_idas.cpp	36.63% <0.00%> (-0.46%)	⬇️

... and 2 files with indirect coverage changes

[dweindl]

Wait, there is already Solver::gett. This should produce the same results.