Modifiers to capture runtime parameters

[pearce8]

We should write 2 modifiers:

1. Export_modifier: writes export at the beginning of the run to grab the environment variables and save the output.
2. Execution_inventory_modifier: at runtime records ramble variables. We should look at what Ramble hashes and determine what of that data is useful to us.

Notes from 25/1/7: Ramble hashes ramble.yaml and the tpl (template) files. Ramble hash docs:

https://ramble.readthedocs.io/en/latest/workspace.html#workspace-inventory-and-hash

• Workspace hashes contain experiments
• Look at the hash digest
• Chained experiments
• Spack log is in here as well? This throws a wrench into being able to look at the runtime parameter differences if the builds are different.

Variables: look at ramble.yaml, it could come from outside of the workspace as well.
All other sections are config sections and could be impacted from outside of the workspace as well.