[CT-2819] default__alter_relation_add_remove_columns macro does not use quoting with case sensitive Snowflake relation

[McKnight-42]

resolves #250 docs dbt-labs/docs.getdbt.com/#

Problem

Try to fix issue around case sensitive column quoting in macro default__alter_relation_add_remove_columns

Solution

update the dbt-adapters default implementation test against postgres and other adapted as needed to maintain compaitiablity, update dbt-snowflake implementation of macro

create test in dbt-tests-adapters and inherit in adapters as needed.

Checklist

• [ ] I have read the contributing guide and understand what's expected of me
• [ ] I have run this code in development, and it appears to resolve the stated issue
• [ ] This PR includes tests, or tests are not required/relevant for this PR
• [ ] This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc.) or this PR has already received feedback and approval from Product or DX

[github-actions[bot]]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.

[McKnight-42]

NOTES: usage across adapters

Adapters that use own implementation of alter_relation_add_remove_columns (defined in dot-adapters)

• Dbt-snowflake
• Dbt-redshift
• Dbt-spark

Adapters that would use default if at all (not referenced in either adapter directly)

• Dbt-postgres
• Dbt-bigquery