Feature request: interval_compare()

[moralec]

Is your feature request related to a problem? Please describe.
A flexible function to compare changes period on period across HR Attributes.

Describe the solution you'd like
A function that calculates the averages of any wpa metric for a baseline and a follow up period, and their corresponding change.
API:

interval_compare(
data,
hrvar,
compvar,
before_start = min(as.Date(data$Date, "%m/%d/%Y")),
before_end,
after_start = as.Date(before_end) + 1,
after_end = max(as.Date(data$Date, "%m/%d/%Y")),
return = "count"
)

Return: Table
group Before After Delta

1 Biz Dev 7.02 7.72 0.70

Return: Plot