fix(dataset import): Support catalog field during dataset import

[Vitor-Avila]

SUMMARY

Support for catalogs have been recently added to Superset. The field is now included in the dataset metadata (including the exported YAML). This PR adds the catalog field to the import schema (logic to handle the catalog during import was already there).

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

No UI changes.

TESTING INSTRUCTIONS

Added the catalog field to the mock dataset. Manual test would require:

1. Create a dataset. Make sure the catalog field is added to the metadata.
2. Export the dataset.
3. Import it.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• 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

All modified and coverable lines are covered by tests ✅

Project coverage is 83.69%. Comparing base (76d897e) to head (dc064c7).
Report is 966 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #29576       +/-   ##
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+ Coverage   60.48%   83.69%   +23.20%     
===========================================
  Files        1931      524     -1407     
  Lines       76236    37772    -38464     
  Branches     8568        0     -8568     
===========================================
- Hits        46114    31612    -14502     
+ Misses      28017     6160    -21857     
+ Partials     2105        0     -2105     

Flag	Coverage Δ
hive	49.13% <100.00%> (-0.04%)	⬇️
javascript	?
mysql	76.99% <100.00%> (?)
postgres	77.09% <100.00%> (?)
presto	53.71% <100.00%> (-0.10%)	⬇️
python	83.69% <100.00%> (+20.20%)	⬆️
sqlite	76.58% <100.00%> (?)
unit	59.74% <100.00%> (+2.11%)	⬆️

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