RFR: 7096: Bring back Object statistics table for heap. [v2]

[Marcus Hirt]

On Mon, 29 Aug 2022 15:32:17 GMT, Virag Purnam <duke at openjdk.org> wrote:

>> In the memory page, below mentioned columns have been added as per the request from customer. These columns are not visible by default. Users can select these from "Visible Columns" option. Customer wants these columns for the "Object Statistics". 
>> 
>> - Avg Live Count
>> - Avg Live Size
>> - Live Instances Increase
>> - Percentage of Heap
>> 
>> ![ObjectStatistics](https://user-images.githubusercontent.com/97600378/186091512-b434560a-96b1-4e62-80b8-029ae95169bf.jpg)
>
> Virag Purnam has updated the pull request incrementally with one additional commit since the last revision:
> 
>   7096: Bring back Object statistics table for heap.

Marked as reviewed by hirt (Lead).

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PR: https://git.openjdk.org/jmc/pull/420