Refactor gridded wave post to match other components

[WalterKolczynski-NOAA]

What new functionality do you need?

The gridded wave post script currently loops over all forecast hours and acts as its own post manager. Other component post and product scripts operate on one forecast time. Wave post should be updated to match, resulting in a bunch of short jobs instead of one long job (per member).

What are the requirements for the new functionality?

Gridded wave post scripts that only process one forecast hour that is specified before the j-job is called.

Acceptance Criteria

• [ ] Gridded wave post scripts that process only one forecast hour specified by the workflow manager (rocoto/ecflow)
• [ ] Rocoto workflow updated to create the corresponding tasks for the new paradigm
• [ ] Output identical to current system

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