Extend sensitivity analysis
Created by: BarabanovaIrina
What's new:
- Added ChainSensitivityAnalysis facade to allow application of structural and non-structural (currently hyperparameters estimation) analysis approaches together.
- Added ChainAnalysis to apply MultiOperationsAnalysis: apply Sobol method to all the hyperparameters of all chain operations.
- Added Multi-Times-Analysis to decrease the chain size, using ChainStructureAnalysis.
- Added Node ratings corresponding to its sensitivity index.
Docs updated.