On-the-fly sparse interpolation

[FHoltorf]

Incorporate on-the-fly sparse interpolation as studied by

@Article{naderi2023adaptive,
title={Adaptive sparse interpolation for accelerating nonlinear stochastic reduced-order modeling with time-dependent bases},
author={Naderi, Mohammad Hossein and Babaee, Hessam},
journal={Computer Methods in Applied Mechanics and Engineering},
volume={405},
pages={115813},
year={2023},
publisher={Elsevier}
}

for integrating the DO/(BiDO) equations naively into the operator splitting and unconventional integrators.

[codecov-commenter]

Codecov Report

Merging #7 (e0eba3d) into main (2f8823e) will decrease coverage by 10.43%.
The diff coverage is 62.56%.

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@@             Coverage Diff             @@
##             main       #7       +/-   ##
===========================================
- Coverage   82.85%   72.42%   -10.43%     
===========================================
  Files           7        9        +2     
  Lines         490      972      +482     
===========================================
+ Hits          406      704      +298     
- Misses         84      268      +184     

Impacted Files	Coverage Δ
src/integrators/projector_splitting.jl	52.63% <2.04%> (-44.89%)	⬇️
src/integrators/rank_adaptive_unconventional.jl	66.12% <10.44%> (-31.59%)	⬇️
src/integrators/greedy_integrator.jl	66.15% <66.66%> (+16.83%)	⬆️
src/integrators/on_the_fly_interpolation.jl	81.96% <81.96%> (ø)
src/sparse_interpolation.jl	85.79% <85.79%> (ø)
src/integrators/unconventional.jl	94.57% <93.10%> (-2.09%)	⬇️
src/primitives.jl	95.52% <94.23%> (+2.66%)	⬆️

... and 2 files with indirect coverage changes

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