decompression time metric, ie `query/decompress/time`

[Egor Ryashin]

Hey,

I wonder if we add a metric which shows query column decompression time,
does it make sense? When a segment is loaded by the Historical node into
memory the Historical has to decompress columns before filtering and
aggregation, and I don't have any information about how much the
decompression time contributes to the total query time.

Thanks,
Egor