feature request: add fieldtimestamp to eth_getLogs response

Why should this feature exist?

every time I make an eth_getLogs request and the response has no field of time. I have to make other requests such as eth_getBlock to fetch field timestamp information.

Implementation

Are you willing to implement this feature?

Yes, I will be very willing to help if I can.

#4950

Actually, I modify the request, I wonder if this pull request is good enough. Plz have a check.