[WIP] Tests for permuted dense sparsediffengine

[dance858]

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Benchmarks that have stayed the same:

   before           after         ratio
 [f979db7c]       [914a1b90]
     23.9±0ms         26.2±0ms     1.10  high_dim_convex_plasticity.ConvexPlasticity.time_compile_problem
      2.53±0s          2.62±0s     1.04  quantum_hilbert_matrix.QuantumHilbertMatrix.time_compile_problem
      1.52±0s          1.57±0s     1.03  tv_inpainting.TvInpainting.time_compile_problem
     48.6±0ms         49.9±0ms     1.03  matrix_stuffing.SmallMatrixStuffing.time_compile_problem
      790±0ms          807±0ms     1.02  matrix_stuffing.ConeMatrixStuffingBench.time_compile_problem
      1.45±0s          1.47±0s     1.01  matrix_stuffing.ParamConeMatrixStuffing.time_compile_problem
      1.03±0s          1.04±0s     1.01  gini_portfolio.Cajas.time_compile_problem
      994±0ms          999±0ms     1.00  finance.FactorCovarianceModel.time_compile_problem
      5.52±0s          5.54±0s     1.00  optimal_advertising.OptimalAdvertising.time_compile_problem
      3.98±0s          3.99±0s     1.00  huber_regression.HuberRegression.time_compile_problem
     15.0±0ms         15.1±0ms     1.00  simple_QP_benchmarks.ParametrizedQPBenchmark.time_compile_problem
      9.90±0s          9.91±0s     1.00  simple_LP_benchmarks.SimpleLPBenchmark.time_compile_problem
      21.3±0s          21.3±0s     1.00  sdp_segfault_1132_benchmark.SDPSegfault1132Benchmark.time_compile_problem
      235±0ms          235±0ms     1.00  gini_portfolio.Murray.time_compile_problem
      1.80±0s          1.80±0s     1.00  simple_QP_benchmarks.UnconstrainedQP.time_compile_problem
     14.9±0ms         14.9±0ms     1.00  simple_LP_benchmarks.SimpleFullyParametrizedLPBenchmark.time_compile_problem
      711±0ms          708±0ms     1.00  simple_QP_benchmarks.LeastSquares.time_compile_problem
      13.0±0s          13.0±0s     1.00  finance.CVaRBenchmark.time_compile_problem
      4.51±0s          4.48±0s     0.99  svm_l1_regularization.SVMWithL1Regularization.time_compile_problem
      893±0ms          885±0ms     0.99  simple_LP_benchmarks.SimpleScalarParametrizedLPBenchmark.time_compile_problem
      294±0ms          290±0ms     0.99  matrix_stuffing.ParamSmallMatrixStuffing.time_compile_problem
      330±0ms          325±0ms     0.98  gini_portfolio.Yitzhaki.time_compile_problem
      247±0ms          243±0ms     0.98  simple_QP_benchmarks.SimpleQPBenchmark.time_compile_problem
      283±0ms          277±0ms     0.98  slow_pruning_1668_benchmark.SlowPruningBenchmark.time_compile_problem
      534±0ms          519±0ms     0.97  semidefinite_programming.SemidefiniteProgramming.time_compile_problem