Merge IOField and Metadata into new Omega Field class

[philipwjones]

This merges the previous IOField and Metadata clases into a single Field class in order to reduce the number of calls needed to register a field. It also:

• adds new functionality for querying field properties and memory locations (needed for upcoming IOStreams)
• adds code to have the HorzMesh class compute and register the horizontal dimensions in the new Dimension class

The changes have been propagated throughout existing code and the documentation has been updated to reflect the change.

Passes tests on Chrysalis/Intel and Frontier (cpu/gpu)

Checklist

• [x] Documentation:
  • [x] User's Guide has been updated
  • [x] Developer's Guide has been updated
  • [x] Documentation has been built locally and changes look as expected
• [x] Testing
  • [x] A comment in the PR documents testing used to verify the changes including any tests that are added/modified/impacted.
  • [x] CTest unit tests for new features have been added per the approved design.
  • [x] Unit tests have passed. Please provide a relevant CDash build entry for verification.

[philipwjones]

Thanks @mwarusz . I merged your mods. Regarding the Err code checking, I like checking up the call tree to provide a trace so we know the path to the error in addition to the error itself. To fix the clutter issue, I eventually want to create an error check function call, so that these checks look more like if (checkErr(Err, Msg)) return Err; rather than a 4-line if block.

[philipwjones]

Rebased and re-tested. Will merge this before I leave.