Add mortgage rates for UY

[ddnt1]

Similar to how https://bancodedatos-fcs.shinyapps.io/tasas/ does for personal loans, poll main banks for mortgage rates (sadly no centralized BCU data):

• https://www.bbva.com.uy/personas/productos/prestamos/hipotecario/hipotecario.html
• https://www.hsbc.com.uy/uruguay/internetpub.nsf/Content/personas_prestamos_hipotecarios.html
• https://www.itau.com.uy/inst/prestamos-hipotecarios.html
• https://www.bhu.com.uy/credito/prestamo-sonado (there are several types products)
• https://www.creditohipotecariosantander.com.uy/
• https://www.scotiabank.com.uy/Personas/Prestamos/Productos/prestamoinmobiliario/prestamoinmobiliario

Just like other countries, charts should (ideally) include data depending on currency (UI/USD) and term (10,15, 20, 25 years?)

Examples:

• https://fred.stlouisfed.org/categories/114?t=fixed&ob=pv&od=desc
• https://www.freddiemac.com/pmms