fix: import dataset with extra; Vertica URI

[betodealmeida]

SUMMARY

Two small fixes for the import functionality:

1. The schema for importing the extra field in datasets was incorrect, preventing datasets to be imported.
2. The SQLAlchemy URI was being parsed with urllib.parse.urlparse to extract the password, but that failed on a Vertica URI (vertica+vertica_python://hackathon:XXXXXXXXXX@host:5433/dbname?ssl=1).

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TEST PLAN

Added unit tests.

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #14698 (77663d5) into master (32f5f36) will decrease coverage by 0.20%.
The diff coverage is 76.47%.

@@            Coverage Diff             @@
##           master   #14698      +/-   ##
==========================================
- Coverage   77.51%   77.31%   -0.21%     
==========================================
  Files         958      958              
  Lines       48560    48572      +12     
  Branches     5703     5703              
==========================================
- Hits        37642    37554      -88     
- Misses      10718    10818     +100     
  Partials      200      200              

Flag	Coverage Δ
hive	?
mysql	81.37% <100.00%> (-0.01%)	⬇️
postgres	81.40% <100.00%> (?)
presto	?
python	81.48% <100.00%> (-0.38%)	⬇️
sqlite	81.02% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...-frontend/src/SqlLab/components/SouthPane/state.ts	100.00% <ø> (ø)
...erset-frontend/src/SqlLab/components/SqlEditor.jsx	54.62% <ø> (ø)
...src/components/FilterableTable/FilterableTable.tsx	82.26% <ø> (ø)
...erset-frontend/src/SqlLab/components/ResultSet.tsx	70.00% <66.66%> (ø)
...rset-frontend/src/SqlLab/components/QueryTable.jsx	66.66% <100.00%> (ø)
...tend/src/SqlLab/components/SouthPane/SouthPane.tsx	79.54% <100.00%> (ø)
superset/databases/schemas.py	99.54% <100.00%> (-0.01%)	⬇️
superset/datasets/commands/export.py	78.72% <100.00%> (ø)
superset/datasets/commands/importers/v1/utils.py	57.14% <100.00%> (ø)
superset/datasets/schemas.py	96.46% <100.00%> (ø)
... and 23 more

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