Feat/find mtk steady state

[1-Bart-1]

Add a MTK steady state finder, and remove the kps4_3l residual model.

[codecov]

Codecov Report

Attention: Patch coverage is 94.32314% with 13 lines in your changes missing coverage. Please review.

Project coverage is 87.42%. Comparing base (c50bbe8) to head (b7d1ce5).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/KPS4_3L.jl	95.77%	9 Missing ⚠️
src/KiteModels.jl	69.23%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
- Coverage   94.80%   87.42%   -7.39%     
==========================================
  Files           6        5       -1     
  Lines        1540     1272     -268     
==========================================
- Hits         1460     1112     -348     
- Misses         80      160      +80     

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[ufechner7]

I checked out your branch locally and tried to create a fresh system image. I get the following error message

[ Info: PackageCompiler: Executing /home/ufechner/repos/KiteModels.jl/test/test_for_precompile.jl => /tmp/jl_packagecompiler_TJF8dw/jl_65cPoA
Running models
ERROR: LoadError: MethodError: no method matching init_sim!(::KPS4_3L{Float64, StaticArraysCore.MVector{3, Float64}, 24, 24, KiteModels.Spring{Int16, Float64}}; stiffness_factor::Float64, prn::Bool, mtk::Bool, torque_control::Bool)

Closest candidates are:
  init_sim!(::KPS4_3L; t_end, stiffness_factor, prn, torque_control) got unsupported keyword argument "mtk"
   @ KiteModels ~/repos/KiteModels.jl/src/KPS4_3L.jl:328
  init_sim!(::KiteModels.AbstractKiteModel; t_end, stiffness_factor, delta, prn) got unsupported keyword arguments "mtk", "torque_control"
   @ KiteModels ~/repos/KiteModels.jl/src/KiteModels.jl:501

Stacktrace:
 [1] kwerr(::@NamedTuple{stiffness_factor::Float64, prn::Bool, mtk::Bool, torque_control::Bool}, ::Function, ::KPS4_3L{Float64, StaticArraysCore.MVector{3, Float64}, 24, 24, KiteModels.Spring{Int16, Float64}})
   @ Base ./error.jl:165
 [2] top-level scope
   @ ~/repos/KiteModels.jl/test/test_for_precompile.jl:121
in expression starting at /home/ufechner/repos/KiteModels.jl/test/test_for_precompile.jl:102

Can you fix that?