[FRAME] Benchmarking should count deletions

[ggwpez]

The benchmarked weights currently only contain reads and writes. With state version 1, there is a big over-estimation when deleting keys since it will still consider the MEL bound for those.
Need to split it up into READS/WRITES/DELETES and then limit the deletion PoV weight of the value to 32.

I did not check the code recently on how the backend would know that something is deleted instead of written, but probably possibly to find out.