[Feature] Column-level descriptions for Snowflake Iceberg tables

### Is this your first time submitting a feature request?

- [x] I have read the [expectations for open source contributors](https://docs.getdbt.com/docs/contributing/oss-expectations)
- [x] I have searched the existing issues, and I could not find an existing issue for this feature
- [x] I am requesting a straightforward extension of existing dbt functionality, rather than a Big Idea better suited to a discussion

### Describe the feature

Enable column-level descriptions for Snowflake Iceberg tables.

### Describe alternatives you've considered

_No response_

### Who will this benefit?

People using Iceberg tables.

### Are you interested in contributing this feature?

Update this:

https://github.com/dbt-labs/dbt-adapters/blob/c16cc7047e8678f8bb88ae294f43da2c68e9f5cc/dbt-snowflake/src/dbt/include/snowflake/macros/adapters.sql#L110-L121

Uses:

https://github.com/dbt-labs/dbt-adapters/blob/c16cc7047e8678f8bb88ae294f43da2c68e9f5cc/dbt-snowflake/src/dbt/include/snowflake/macros/adapters.sql#L1-L16

### Anything else?

_No response_