Refactor derivative names

[lkdvos]

This removes the ∂∂_ names in favor of more descriptive names.

[codecov]

Codecov Report

Attention: Patch coverage is 88.23529% with 20 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/algorithms/derivatives/mpo_derivatives.jl	82.60%	4 Missing ⚠️
src/algorithms/groundstate/vumps.jl	50.00%	4 Missing ⚠️
src/algorithms/timestep/tdvp.jl	86.66%	4 Missing ⚠️
src/algorithms/derivatives/derivatives.jl	91.66%	3 Missing ⚠️
.../algorithms/derivatives/hamiltonian_derivatives.jl	85.71%	2 Missing ⚠️
src/algorithms/statmech/vomps.jl	50.00%	2 Missing ⚠️
src/algorithms/grassmann.jl	75.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/algorithms/ED.jl	100.00% <100.00%> (ø)
src/algorithms/approximate/fvomps.jl	95.65% <100.00%> (ø)
src/algorithms/approximate/idmrg.jl	95.74% <100.00%> (ø)
src/algorithms/approximate/vomps.jl	94.73% <100.00%> (ø)
src/algorithms/changebonds/optimalexpand.jl	100.00% <100.00%> (ø)
src/algorithms/changebonds/vumpssvd.jl	100.00% <100.00%> (ø)
...c/algorithms/derivatives/projection_derivatives.jl	100.00% <100.00%> (+7.14%)	⬆️
src/algorithms/excitation/chepigaansatz.jl	91.48% <100.00%> (ø)
src/algorithms/expval.jl	87.30% <100.00%> (+12.69%)	⬆️
src/algorithms/fidelity_susceptibility.jl	100.00% <100.00%> (ø)
... and 12 more

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