Migrate to dbt-common and dbt-adapters package

[McKnight-42]

resolves #890
docs dbt-labs/docs.getdbt.com/#

Problem

dbt-core is updating name spacing for dbt-common this pr is to have a base of work to test and merge into feature branch once they are ready.

Solution

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]

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 dbt-snowflake contributing guide.

[emmyoop]

Just a nit on the way something was already done.

[emmyoop]

Is there a reason to not use the same pattern as other imports instead, ie

from dbt_common.clients.agate_helper import empty_table

and then this line is

table = empty_table()

[McKnight-42]

was actually looking at that myself earlier, going to double check that we aren't using something else called agate_helpper to prevent a name collision, that's really the only other use case I've seen it done this way via exceptions.

[martynydbt]

Thank you @emmyoop and @colin-rogers-dbt for approving! Nice progress!