OMPT Target Offload Support (#17)

- Porting from https://github.com/ROCm/omnitrace/pull/411
- Improve OMPT support
- Add OpenMP target example to testing
- Update Timemory submodule to use ROCm/Timemory rather than NERSC/Timemory
- Update `actions/upload-artifacts` to v4
- Standardize the `cmake_minimum_required` to 3.18.4 across workflows, project, and examples
- Updated Ubuntu 20.04 workflows

docs/conceptual/rocprof-sys-feature-set.rst

@@ -7,7 +7,7 @@ The ROCm Systems Profiler feature set and use cases
 ***************************************
 
 `ROCm Systems Profiler <https://github.com/ROCm/rocprofiler-systems>`_ is designed to be highly extensible.
-Internally, it leverages the `Timemory performance analysis toolkit <https://github.com/NERSC/timemory>`_
+Internally, it leverages the `Timemory performance analysis toolkit <https://github.com/ROCm/timemory>`_
 to manage extensions, resources, data, and other items. It supports the following features,
 modes, metrics, and APIs.