new SU4, fix stats test, fix doc test

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (cleanup-autodiff@6f40a59). Click here to learn what that means. The diff coverage is 91.66%.

@@                Coverage Diff                 @@
##             cleanup-autodiff     #14   +/-   ##
==================================================
  Coverage                    ?   78.4%           
==================================================
  Files                       ?      28           
  Lines                       ?     565           
  Branches                    ?       0           
==================================================
  Hits                        ?     443           
  Misses                      ?     122           
  Partials                    ?       0

Impacted Files	Coverage Δ
src/block_extension/math_gate.jl	94.73% <ø> (ø)
src/block_extension/pauli_strings.jl	83.78% <ø> (ø)
src/block_extension/reflect_gate.jl	100% <ø> (ø)
src/diff_extension/stats.jl	88.46% <100%> (ø)
src/diff_extension/kernel_mmd.jl	92% <100%> (ø)
src/diff_extension/diffs.jl	100% <100%> (ø)
src/easybuild/general_U4.jl	87.5% <87.5%> (ø)

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