`samebases(::AbstractOperator, ...)` should use calls to `basis` instead of assuming internal layout for the structures

[Krastanov]

See here:

QuantumInterface.jl/src/linalg.jl

Lines 1 to 3 in d385ebe

	samebases(a::AbstractOperator) = samebases(a.basis_l, a.basis_r)::Bool
	samebases(a::AbstractOperator, b::AbstractOperator) = samebases(a.basis_l, b.basis_l)::Bool && samebases(a.basis_r, b.basis_r)::Bool
	check_samebases(a::Union{AbstractOperator, AbstractSuperOperator}) = check_samebases(a.basis_l, a.basis_r)

Assuming that these structures internally have .basis fields breaks in many important cases. This should instead just use formalized interfaces like calls to basis.

This is a special case of issue #12