Revise integrator interface

[michakraus]

No description provided.

[codecov]

Codecov Report

Merging #176 (df29c07) into main (3b8a211) will decrease coverage by 0.12%.
The diff coverage is 89.40%.

@@            Coverage Diff             @@
##             main     #176      +/-   ##
==========================================
- Coverage   60.57%   60.45%   -0.12%     
==========================================
  Files         118      117       -1     
  Lines        7989     7902      -87     
==========================================
- Hits         4839     4777      -62     
+ Misses       3150     3125      -25     

Files Changed	Coverage Δ
src/Integrators.jl	100.00% <ø> (ø)
src/initial_guess/initial_guess.jl	17.64% <0.00%> (ø)
src/integrators/integrator.jl	89.70% <ø> (ø)
src/integrators/rk/methods.jl	58.54% <ø> (+6.21%)	⬆️
src/projections/projection.jl	87.50% <ø> (ø)
src/solutions/solution.jl	75.00% <ø> (ø)
src/integrators/rk/abstract.jl	15.15% <6.89%> (-84.85%)	⬇️
src/integrators/dvi/dvi_common.jl	66.66% <66.66%> (ø)
src/initial_guess/hermite.jl	56.60% <75.00%> (ø)
src/initial_guess/midpoint.jl	50.00% <77.77%> (ø)
... and 49 more

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