Join the DA and RT 'SimulationResults'

[rafaelamaribeiro]

Join the RT SimulationResults (form UC-RT simulation) with the DA SimulationResults (from the UC-ED simulation) not using an external dictionary (current solution).

Simulations using the UCEDRT market simulator are currently two separate simulations given limitations of PowerSimulations, thus results are outputted separately. In order to make it consistent with other market simulators, all simulations output a dictionary where keys indicate the market (DA or RT) and values are the SimulationResults from the appropriate PowerSimulations.Simulations (UC-ED or UC-RT).

It should be possible to output a single SimulationResults containing information from both simulations (in the case of UCEDRT)

Moreover, some simulations are still MarketSimulator-dependent (e.g. evaluate_prices_UCEDRT), and, instead, we should have an appropriate multiple dispatch solution.