Fixes related to run_fcst integration

[christinaholtNOAA]

Synopsis

A small collection of changes that were needed or useful during the SRW run_fcst integration. They include:

• A fix to the lateral boundary condition logic
• The addition of a !bool tag for YAML
• Treating the fv3 diag_table as a template instead of a file path.

Type

• Bug fix (corrects a known issue)
• Code maintenance (refactoring, etc. without behavior change)
• Documentation
• Enhancement (adds new functionality)
• Tooling (CI, code-quality, packaging, revision-control, etc.)

Impact

• This is a breaking change (changes existing functionality)
• This is a non-breaking change (existing functionality continues to work as expected)

Checklist

• I have added myself and any co-authors to the PR's Assignees list.
• I have reviewed the documentation and have made any updates necessitated by this change.

[maddenp-noaa]

Looks good. I made one small suggestion about a schema-enforced dict lookup.