Benchpark Rewrite Roadmap

[pearce8]

• System init, docs. Add command: benchpark system init #298 - merging 8/19
• Experiment init, docs. Experiment init #331 @alecbcs @becker33 - merge before 8/22
• Re-create all existing LC systems (manual checking) - start 8/22
• Re-create all existing experiments (manual checking) - start 8/22

(feature parity here)

• Add dry run test for new experiments and new systems. Add a dry run test for our new experiments and systems #343 @alecbcs @scheibelp
• Enable Caliper modifiers with our new experiments. Create amg2023 experiment.py #352 @rfhaque
• Add equivalence test for experiments Equivalence test for experiment.py #353 @becker33
• Make progress on spack diff Equivalence test for system.py #354 @scheibelp
• Workflow docs (aspirational to start and keep us on track). Workflow docs #333 @dyokelson @alecbcs
• Unifying command to generate a workspace (tied with workflow docs) Benchpark init #336
  This is to support the next item
• Implement compatibility checking between system (provides cuda) and experiment (requires cuda). Design 8/26
  Allows Experiments to assume they have a compatible System for all initialization methods
  Systems define provides and Experiments define requires
  Compatibility information is consumed by concretizer for ExperimentSpec
• Break cmds into their own files. (Spackify the lib/ structure.) @becker33
• System create, docs (with a template like spack create foo)
• Experiment create, docs (with a template spack create foo)
• Mechanism to pass Benchpark and Ramble variables to Caliper Pass Benchpark and Ramble variables to Caliper #355 @dyokelson