frequency json

[kfan326]

Added json output for frequency data: Currently implemented for Intel Skylake through Kabylake. AMD Epyc, IBM Power9, AMD GPUs, nVidia GPUs.

Fixes #

Commit message:

json output for frequency data

-add docs
-supports Intel, AMD, IBM Power9 CPUs; AMD, nVidia GPUs

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature/architecture support (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Build/CI update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please provide hardware architecture specs and
instructions so we can reproduce.

• Test A: Octomore
• Test B: Lassen

{
    "lassen32": {
        "timestamp": 1699315058326702,
        "socket_0": {
            "CPU": {
                "cpu_avg_freq_mhz": 3441
            },
            "GPU": {
                "gpu_0_freq_mhz": 135,
                "gpu_0_mem_freq_mhz": 877,
                "gpu_1_freq_mhz": 135,
                "gpu_1_mem_freq_mhz": 877
            }
        }
    }
}

• Test C: Tioga

Checklist:

• I have run ./scripts/check-code-format.sh and confirm my code code follows the style guidelines of variorum
• I have added comments in my code
• My changes generate no new warnings (build with -DENABLE_WARNINGS=ON)
• New and existing unit tests pass with my changes

Thank you for taking the time to contribute to Variorum!

[slabasan]

Conflicts addressed and replaced by #488