Owner/Expert Metadata for Tables

# Owner/Expert Metadata for Tables/Models

## Description / Need
We need a simple way to add owner/expert metadata to each table to improve discoverability and make it clear who to contact for specific data questions.

### Proposed Solution
1. **CLI Tool**: Build a CLI tool to update table metadata with owner/expert tags.
2. **Metadata Storage**: Use a YAML file in the repo as the source of truth for all table metadata
3. **Automation**: Leverage GitHub Actions (GHA) to sync metadata updates from the YAML file to a BigQuery table
4. **Visibility**: Start with the CLI and YAML setup, expanding visibility options as the number of tables grows.

### Notes on Metadata
- **BQ-Specific**: Use labels, tags, or descriptions in BQ for tables that support metadata.
- **Centralized Approach**: A centralized YAML-based solution that lives in the repository itself will also update platforms like BQ while covering non-BQ assets.