Add JET test for MIRKN methods

[ErikQQY]

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Benchmark Results

	master	22664fc...	master/22664fc1e88f00...
Simple Pendulum/IIP/BoundaryValueDiffEqMIRK.MIRK2()	6.68 ± 0.16 ms	6.83 ± 0.13 ms	0.978
Simple Pendulum/IIP/BoundaryValueDiffEqMIRK.MIRK3()	2.56 ± 0.12 ms	2.67 ± 0.12 ms	0.962
Simple Pendulum/IIP/BoundaryValueDiffEqMIRK.MIRK4()	0.93 ± 0.051 ms	0.957 ± 0.049 ms	0.971
Simple Pendulum/IIP/BoundaryValueDiffEqMIRK.MIRK5()	2.49 ± 0.27 ms	2.56 ± 0.41 ms	0.971
Simple Pendulum/IIP/BoundaryValueDiffEqMIRK.MIRK6()	1.09 ± 0.088 ms	1.14 ± 0.12 ms	0.952
Simple Pendulum/IIP/MultipleShooting(10, Tsit5; grid_coarsening = false)	1.95 ± 0.6 ms	1.97 ± 0.61 ms	0.992
Simple Pendulum/IIP/MultipleShooting(10, Tsit5; grid_coarsening = true)	3.53 ± 0.58 ms	3.59 ± 0.9 ms	0.982
Simple Pendulum/IIP/MultipleShooting(100, Tsit5; grid_coarsening = false)	0.0534 ± 0.0078 s	0.0525 ± 0.0062 s	1.02
Simple Pendulum/IIP/MultipleShooting(100, Tsit5; grid_coarsening = true)	0.0694 ± 0.012 s	0.067 ± 0.013 s	1.04
Simple Pendulum/IIP/Shooting(Tsit5())	0.252 ± 0.079 ms	0.244 ± 0.077 ms	1.03
Simple Pendulum/OOP/BoundaryValueDiffEqMIRK.MIRK2()	0.0391 ± 0.00087 s	0.04 ± 0.0007 s	0.977
Simple Pendulum/OOP/BoundaryValueDiffEqMIRK.MIRK3()	11.5 ± 0.27 ms	11.8 ± 0.51 ms	0.972
Simple Pendulum/OOP/BoundaryValueDiffEqMIRK.MIRK4()	3.37 ± 0.21 ms	3.44 ± 0.21 ms	0.977
Simple Pendulum/OOP/BoundaryValueDiffEqMIRK.MIRK5()	9.78 ± 0.9 ms	10.1 ± 0.95 ms	0.972
Simple Pendulum/OOP/BoundaryValueDiffEqMIRK.MIRK6()	3.59 ± 0.25 ms	3.66 ± 0.28 ms	0.979
Simple Pendulum/OOP/MultipleShooting(10, Tsit5; grid_coarsening = false)	3.33 ± 2.6 ms	3.54 ± 2.7 ms	0.942
Simple Pendulum/OOP/MultipleShooting(10, Tsit5; grid_coarsening = true)	5.99 ± 4.3 ms	6.02 ± 4.4 ms	0.994
Simple Pendulum/OOP/MultipleShooting(100, Tsit5; grid_coarsening = false)	0.0973 ± 0.0059 s	0.103 ± 0.015 s	0.949
Simple Pendulum/OOP/MultipleShooting(100, Tsit5; grid_coarsening = true)	0.119 ± 0.011 s	0.127 ± 0.014 s	0.943
Simple Pendulum/OOP/Shooting(Tsit5())	0.61 ± 0.038 ms	0.616 ± 0.039 ms	0.99
time_to_load	6.14 ± 0.041 s	6.26 ± 0.21 s	0.981

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR.
Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).

[ErikQQY]

Since most of the changes are related to the refactoring and testing stuff, this PR will be merged and released when the CI is all green to not block incoming PRs.