Add a way to pass the exact eviction time to the eviction listener?

[tatsuya6502]

Split from #349 (comment)

one more thing, could you please kindly think of a way to pass exact eviction_time?

so maybe we could have two variants of eviction_listener functions, one could be executed without evection time like what it is now for the sake of backward compatibility, and another one could be executed with exact time that the eviction has really happened.

in my eviction_listener i have to check if the eviction has happened after certain time or not, so having the exact eviction time could help me to have a more solid eviction_listener function.

CC: @unikzforce

[unikzforce]

Thanks!