Allow the walrus operator to be used in the while loop in WPS332

[MatMerd]

WPS332 prohibits the use of the walrus operator (:=) outside of comprehensions, but I think it could be allowed for the while loop too. Example:

while something := fetch_something(offset, limit, filters):
    DO_WORK

I think it looks clear and as readable as the standard while loop code.

while True:
    something = fetch_something(offset, limit, filters)
    if not something:
        break
    DO_WORK

[MatMerd]

And can I take on this task?