kelly_rolling_quadrature: Rolling period quadrature Kelly criterion
In shill1729/KellyCriterion: Log-optimal stock allocation

Function to compute rolling quadrature Kelly criterion. Can take constant or variable rate.

kelly_rolling_quadrature(
  returns,
  n,
  rate,
  constrain = FALSE,
  lb = -0.5,
  ub = 0.5
)

`returns`	the time series of daily returns
`n`	number of days to roll by
`rate`	interest rate of relevance, assumes the input is annualized (deannualized inside the function)
`constrain`	whether to constrain the capital or not
`lb`	lower bound capital limit
`ub`	upper bound capital limit