replace dbt/common with dbt-common

[MichelleArk]

resolves #9357

Problem

The contents of dbt/common are being moved to dbt-common, so we can now delete dbt/common and its associated tests/dependencies!

Solution

• Delete dbt/common
• Delete tests/unit/common
• Add dbt-common to setup.py (as a GH dependency until release process for dbt-common is ironed out)
  • Associated dbt-common PR: Copy code from dbt core dbt-common#13
• Remove any dependencies / third party stubs that are no longer necessary once dbt/common is moved out

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
• This PR includes type annotations for new and modified functions

[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 contributing guide.

[codecov]

Codecov Report

Attention: 38 lines in your changes are missing coverage. Please review.

Comparison is base (cff0b65) 86.65% compared to head (fa5aa42) 87.08%.

Files	Patch %	Lines
core/dbt/adapters/base/connections.py	28.57%	10 Missing ⚠️
core/dbt/contracts/graph/manifest.py	50.00%	7 Missing ⚠️
core/dbt/adapters/sql/connections.py	63.63%	4 Missing ⚠️
core/dbt/task/base.py	55.55%	4 Missing ⚠️
core/dbt/task/sql.py	0.00%	4 Missing ⚠️
core/dbt/contracts/sql.py	0.00%	3 Missing ⚠️
core/dbt/adapters/base/relation.py	50.00%	2 Missing ⚠️
core/dbt/task/debug.py	83.33%	2 Missing ⚠️
core/dbt/task/docs/generate.py	85.71%	1 Missing ⚠️
core/dbt/task/init.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9342      +/-   ##
==========================================
+ Coverage   86.65%   87.08%   +0.43%     
==========================================
  Files         230      184      -46     
  Lines       27060    23937    -3123     
==========================================
- Hits        23448    20846    -2602     
+ Misses       3612     3091     -521     

Flag	Coverage Δ
integration	84.42% <90.92%> (+0.88%)	⬆️
unit	63.89% <79.13%> (-1.37%)	⬇️

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[emmyoop]

colorama and isodate moved to dbt-common!

[QMalcolm]

9k lines deleted, niiiiice ❤️