Copy code from dbt core

[MichelleArk]

Resolves: dbt-labs/dbt-core#10

Acceptance Criteria

• copy over the contents of dbt/common from dbt-core to dbt-common
• copy over the tests related to dbt/common
• initial pyproject.toml
• point dbt-core to github main of dbt-common: replace dbt/common with dbt-common dbt-core#9342
• remove dbt/common from dbt-core : replace dbt/common with dbt-common dbt-core#9342

Follow-up work:

• point first party adapters to github main of dbt-common
  • will be done as part of ongoing 1p adapter migrations instead

[mikealfare]

I left a few comments. Most were around the idea that we might want to move some of this to dbt-adapter if it's specific to an adapter. In particular, if the primary functionality lives there (e.g. connection), then any associated functionality should also live there (or we need to move the primary back to dbt-common).

[colin-rogers-dbt]

just nitpicking otherwise LGTM

[mikealfare]

fwiw, I'm able to build dbt-adapter off of this branch. I'm working on updating references where I guessed and then running unit tests.

[mikealfare]

Update, I migrated all unit tests to dbt-adapter that seemed relevant to the package. I was able to build dbt-adapter off of this branch and get all 100 unit tests to pass after updating references and limiting scope to dbt-adapter concerns.

[mikealfare]

Approving assuming the cache change goes through as discussed separately.