Add other shocks

[matdehaven]

• [x] Uncertainty shocks (EPU and others from Bloom)

For later:

• [ ] Macro News shock (macro variable releases, high freq)
• [ ] Trade shocks

[matdehaven]

• [ ] Equity Demand shock from Gabaix, X., Koijen, R.S., 2021. In search of the origins of financial fluctuations: The inelastic markets hypothesis. NBER working paper No. 28967. as used in Financial Conditions Targeting (WP). Caballero, Caravello, Simsek.