import-db: support importing a table

[skshetry]

I have also made import-db command visible in the help message and hidden the dbt-specific options.

$ dvc import-db --table customer --conn pgsql

(Note that I haven't added support for downloading a table with dbt's connection profile).

[codecov]

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (d218b6a) 90.50% compared to head (736b66f) 90.47%.
Report is 3 commits behind head on main.

Files	Patch %	Lines
dvc/commands/imp_db.py	37.50%	15 Missing ⚠️
dvc/dependency/db.py	80.00%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10219      +/-   ##
==========================================
- Coverage   90.50%   90.47%   -0.03%     
==========================================
  Files         499      499              
  Lines       37982    38042      +60     
  Branches     5518     5530      +12     
==========================================
+ Hits        34375    34419      +44     
- Misses       2965     2980      +15     
- Partials      642      643       +1     

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[dberenbaum]

Could be a separate PR, but should we drop the dbt part at this point?

[dberenbaum]

Are one of these required?

[skshetry]

Yes they are required, and are mutually exclusive.

[dberenbaum]

LGTM but what do you think about dropping the dbt stuff at this point? Seems like it would be useful to document how you could connect your dbt etl to your dvc pipeline, but I don't see much benefit in keeping the dbt-based implementation here.

[skshetry]

LGTM but what do you think about dropping the dbt stuff at this point? Seems like it would be useful to document how you could connect your dbt etl to your dvc pipeline, but I don't see much benefit in keeping the dbt-based implementation here.

I was thinking of dropping in the next release, but we could do it now. Will create a separate PR.