replace "using MitosisStochasticDiffEq" by "import .. as MSDE"

[frankschae]

cosmetic changes in tests and examples.

[codecov-commenter]

Codecov Report

Merging #70 (74ac523) into main (c501b0f) will increase coverage by 0.90%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
+ Coverage   91.51%   92.42%   +0.90%     
==========================================
  Files           8        7       -1     
  Lines         377      409      +32     
==========================================
+ Hits          345      378      +33     
+ Misses         32       31       -1     

Impacted Files	Coverage Δ
src/filter.jl	94.26% <100.00%> (+0.34%)	⬆️
src/guiding.jl	92.92% <100.00%> (+1.57%)	⬆️
src/sample.jl	100.00% <100.00%> (ø)
src/types.jl	89.70% <100.00%> (+0.47%)	⬆️
src/utils.jl	63.15% <100.00%> (+10.21%)	⬆️

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