Throttle strategy that controls when values are delivered within a time window.

Leading — First value in the window is delivered immediately. Subsequent values are dropped until the window expires.

submit: A---B-C-D-----------E-F---
output: A--------------------E-----
         |--- windowMs ---|   |--- windowMs ---|

Trailing — Values are collected during the window. Only the last value is delivered when the window expires.

submit: A---B-C-D-----------E-F---
output: -----------D--------------F
         |--- windowMs ---|   |--- windowMs ---|

LeadingAndTrailing — First value delivered immediately. The last value in the window is also delivered when the window expires (if different from the leading value).

submit: A---B-C-D-----------E-F---
output: A----------D--------E----F
         |--- windowMs ---|   |--- windowMs ---|