DrvX instrumentation for stat collection

[ywwu928]

Description

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Checklist

• [v] The additions follow the code standards in the developer guide.
• [v] New or existing tests cover these changes.
• [v] The documentation is up to date with these changes.

[ywwu928]

Requires rebuilding the container

[AdityaAtulTewari]

I'd like some more context on what this is trying to do.

[ywwu928]

I'd like some more context on what this is trying to do.

Collecting stat required for performance and system bottleneck investigation.

1. adding stat for stall cycles when a thread is ready
2. Let programmer specify which stage it is in and only collect stats got the actual execution stage but not the graph import stage
3. Collect per phase stat. The support for dynamic stat counter registration is bad so preallocate certain amount of phase stat counters specified and flush it out to the output stat file once it is full
4. add option to only collect and print out necessary stats