[Darwin]:Enable heap based pool configuration

[yufengwangca]

Problem

What is being fixed? Examples:

• Heap based pool configuration has been tested on Linux for a while and no side effect found until now. Instead of always reserve memory for static pool base on worse case. This feature allow the SystemPool allocates memory based on its actual usage and release back to system after usage.

We should enable this feature on more platforms which has large heap support.

Change overview

Enable heap based pool configuration on Darwin

Testing

How was this tested? (at least one bullet point required)

• Covered by Darwin CI