RFR: 8311978: Create abstraction over heap metrics for heuristics [v3]

[Y. Srinivas Ramakrishna]

On Thu, 13 Jul 2023 23:54:33 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> This change introduces a new interface `ShenandoahHeapStats`. Presently, the interface is implemented by `ShenandoahHeap`. The generational mode for Shenandoah will provide a new implementation of this interface `ShenandoahGeneration`.
>
> William Kemper has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Put explicit constructor call back in

Modulo earlier nit about c'tor arguments to Shenandoah{Static,Compact}Heuristic.

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Marked as reviewed by ysr (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/14856#pullrequestreview-1529469005