[DISCUSS] KIP-474: To deprecate WindowStore#put(key, value)

[omkar mestry]

We propose to deprecate the WindowStore#put(key, value), as it does not
have a timestamp as a parameter. The window store requires a timestamp to
map the key to a window frame. This method uses the current record
timestamp(as specified in the description of the method). There is a method
present with a timestamp as a parameter which can be used instead.