Add support for multiple domains

Describe the New Feature

Current version processes one WRF domain. To add support for nested/multiple domains, need to add logic for estimating the number of cores based on the domains, and add logic to post processing for which domains to process and plot, e.g. finest grid only, all grid, etc.

Acceptance Testing

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Describe tests required for new functionality.

Time Estimate

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Issues should represent approximately 1 to 3 days of work.

Sub-Issues

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New Feature Checklist

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Start by locating the current single-domain core-estimation and post-processing entry points in the repository. Define how nested domains affect core counts and whether post-processing selects the finest grid, all grids, or another set, then add tests covering those choices and document the supported input data.