Electronic Greens function and overview page for DMFT

This is a continuation of #1156 (closed) . We can prepare the overview page for DMFT entries including:

• Table with input parameters: beta (inverse temperature), interactions (Hubbard U, ratio JH/U), and total filling: resolve from results.method.simulation.dmft. → to be discussed
• Real part of the Green's function in taus: resolve from results.properties.electronic.greens_functions_electronic.real_greens_function_tau.
• Imaginary part of the self-energy in Matsubaras: resolve from results.properties.electronic.greens_functions_electronic.imag_self_energy_iw.
• Table with orbital occupations of each correlated orbital and spin, and per atom in the unit cell: resolve from results.properties.electronic.greens_functions_electronic.orbital_occupations. Table with quasiparticle weights of each correlated orbital and spin, and per atom in the unit cell: resolve from results.properties.electronic.greens_functions_electronic.quasiparticle_weights. → left for the metainfo data tab and the DMFT workflow plots

These will appear in the Electronic Structure part, after the bands, dos, BZ and band gap information.