Draft: Support for CALIPER, NVTX, and ROCTX labels

• hpcprof: add support for editing contexts after logical labels
• hpcrun:
  • reorganize label API to use foils for CALIPER, NVTX, and ROCTX labels
  • implementation of local label stacks
  • implementation of shared label store

To Demonstrate

Measure a program with CALIPER, NVTX, or ROCTX labels.

Backward Compatibility

• This MR does not alter the data formats.
• This MR does not alter any CLIs.

Additional Information

CALIPER, NVTX, and ROCTX Labels will always be enabled

Checklist

• I have run pre-commit run -a on my local checkout and fixed any reported issues.
• I have confirmed that existing tests and/or the tests added by this MR cover the changes introduced by this MR.
• I have confirmed that any added tests will be automatically run in CI.
• I have updated all relevant documentation:
  • The --help text for the tools
  • The man page for the tools
  • The HPCToolkit User's Manual