Spike: Determine how much the `TableSchema` should follow `ColumnSchema`

We're planning on making some changes to how we handle a column's schema, and some of these changes might make sense on the TableSchema as well. We should consider each of these:
- change the `use_standard_tags` default value to False for the schema (still True for Accessor)?
- Validation?
- Allowing null logical type values?
- This is pretty tied to how we do validation

Note: this is more about our philosophy regarding Schemas vs Accessors and isn't necessary for `ColumnSchema` implementation