RAJAPerf experiment class

[august-knox]

Description
Adding updated experiment class for RAJAPerf. includes, openmp, rocm, cuda implementations, and caliper variant. Added dryrun as well

{x} Adding a system, benchmark, or experiment
{ } Modifying an existing system, benchmark, or experiment
{ } Documentation update
{ } Build/CI update
{ } Benchpark core functionality

Checklist:

If adding/modifying a system:

{ } Create a new directory for the system and a new system.py file
{ } Add a new dry run unit test in .github/workflows
{ } System appears in System Specifications table in docs catalogue section

If adding/modifying a benchmark:

{ } Add a new application.py and (maybe) package.py under a new directory
for this benchmark
{x} Configure an experiment
{ } Benchmark appears in Benchmarks and Experiments table in docs catalogue
section

If adding/modifying a experiment:

{x} Extend experiment.py under existing directory for specific benchmark
{x} Define a single node and multi-node experiments

If adding/modifying core functionality:

{ } Update docs
{x} Update .github/workflows and .gitlab/ci unit tests (if needed)