Separate components of EKI objective functional?

[glwagner]

It might be more convenient to provide the components of the eki objective functional separately rather than tupled toghether as in:

ParameterEstimocean.jl/src/iteration_summary.jl

Line 96 in 8e57118

objective_values = [eki_objective(eki, X[:, j], G[:, j]) for j in 1:size(G, 2)]

@adelinehillier what are your thoughts?