Unable to take tensor product of outer products

[apkille]

julia> @ket k; @bra b;

julia> (k*b) ⊗ (k*b)
ERROR: MethodError: *(::SKet, ::SKet) is ambiguous.

Candidates:
  *(x::SymbolicUtils.Symbolic{T}, c) where T<:Union{QuantumInterface.AbstractBra, QuantumInterface.AbstractKet, QuantumInterface.AbstractOperator, QuantumInterface.AbstractSuperOperator}
    @ QuantumSymbolics ~/Documents/Julia Packages/QuantumJulia/QuantumSymbolics.jl/src/QSymbolicsBase/basic_ops_homogeneous.jl:34
  *(c, x::SymbolicUtils.Symbolic{T}) where T<:Union{QuantumInterface.AbstractBra, QuantumInterface.AbstractKet, QuantumInterface.AbstractOperator, QuantumInterface.AbstractSuperOperator}
    @ QuantumSymbolics ~/Documents/Julia Packages/QuantumJulia/QuantumSymbolics.jl/src/QSymbolicsBase/basic_ops_homogeneous.jl:33

Possible fix, define
  *(::SymbolicUtils.Symbolic{T}, ::SymbolicUtils.Symbolic{T}) where {T<:Union{…}, T<:Union{…}}

Stacktrace:
 [1] prefactorscalings(xs::Vector{SOuterKetBra}; scalar::Bool)
   @ QuantumSymbolics ~/Documents/Julia Packages/QuantumJulia/QuantumSymbolics.jl/src/QSymbolicsBase/rules.jl:26
 [2] prefactorscalings
   @ ~/Documents/Julia Packages/QuantumJulia/QuantumSymbolics.jl/src/QSymbolicsBase/rules.jl:19 [inlined]
 [3] STensorOperator(terms::Vector{SOuterKetBra})
   @ QuantumSymbolics ~/Documents/Julia Packages/QuantumJulia/QuantumSymbolics.jl/src/QSymbolicsBase/basic_ops_homogeneous.jl:158
 [4] tensor(::SOuterKetBra, ::SOuterKetBra)
   @ QuantumSymbolics ~/Documents/Julia Packages/QuantumJulia/QuantumSymbolics.jl/src/QSymbolicsBase/basic_ops_homogeneous.jl:170
 [5] top-level scope
   @ REPL[4]:1
Some type information was truncated. Use `show(err)` to see complete types.

[apkille]

It seems that prefactorscalings attempts to factor out the objects in the outer products. Will address this issue in upcoming PR.