Updates to GPU memory allocation to align with P2P paper

[bo3z]

Description

Updates in GPU memory allocation to use HIP instead of HSA (higher-level function) & adds a library for measuring GPU power/util.

Type of change

• Bug fix
• New feature
• Documentation update
• A new research paper code implementation
• Other

Tests & Results

P2P example works as expected.

Checklist

• I have commented my code and made corresponding changes to the documentation.
• I have added tests/results that prove my fix is effective or that my feature works.
• My changes generate no new warnings or errors & all tests successfully pass.