Add GPU Energy APIs

[tpatki]

Description

Extend the new energy API from v0.8 to include GPU energy on NVIDIA and AMD GPUs.

6/26: This is WIP and won't compile/work just yet.

To Do 6/27:

• Check whether we're reporting deltas in the other API and if the first call to GPU energy needs to be 0.
• Clean out the commented code from variorum.c
• Add AMD Rocm support rsmi_dev_energy_count_get()

Fixes #532.

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?

• Lassen: GPU-only
• Lassen: CPU-only
• Lassen: CPU+GPU
• Corona: GPU-only
• Tioga: GPU-only
• Tioga: CPU+GPU (blocked due to the HSMP module issue, will be tested later.)

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!