Add unit metadata to columns#2149
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Summary
This change introduces a structured, column-level unit field as the long-term home for unit metadata in DJ. Previously unit lived only on
metricmetadataas a flat enum (MetricUnit) and only applied to metric output values. This PR adds the new field to columns, including on all associated column objects likeColumn(ORM),ColumnSpec(YAML),ColumnOutput(API). The legacymetricmetadata.unitpath continues to work unchanged; subsequent PRs will wire it through.Test Plan
make checkpassesmake testshows 100% unit test coverageDeployment Plan