feat(native-filters): add support for import/export dashboard

[villebro]

SUMMARY

Add support for importing and exporting dashboards containing native filters. The modifications are needed to update the dataset ids that are referenced in the dashboard metadata.

BEFORE

Currently native filter dataset references aren't updated during import (compare with the charts that render correctly):

AFTER

Now the native filter dataset references are updated to match those available on the target env:

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

1. export a dashboard
2. import into a new environment where the datasource ids corresponding to those referenced in the native filter metadata are either missing or have a different id.

TODO:

• add tests

ADDITIONAL INFORMATION

• Has associated issue: closes [import/export][native-filters]import/export is incompatible with Native filters #15050
• 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

[zhaoyongjie]

LGTM, tested in my local environment with 2 Superset instance import / export.

[codecov]

Codecov Report

Merging #15253 (6e60b81) into master (745b577) will decrease coverage by 0.25%.
The diff coverage is 51.21%.

❗ Current head 6e60b81 differs from pull request most recent head 89b32f8. Consider uploading reports for the commit 89b32f8 to get more accurate results

@@            Coverage Diff             @@
##           master   #15253      +/-   ##
==========================================
- Coverage   77.26%   77.00%   -0.26%     
==========================================
  Files         971      971              
  Lines       50308    50346      +38     
  Branches     6140     6140              
==========================================
- Hits        38869    38769     -100     
- Misses      11235    11373     +138     
  Partials      204      204              

Flag	Coverage Δ
hive	?
mysql	81.65% <51.21%> (-0.05%)	⬇️
postgres	81.66% <51.21%> (-0.05%)	⬇️
presto	?
python	81.75% <51.21%> (-0.50%)	⬇️
sqlite	81.30% <51.21%> (-0.05%)	⬇️

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Impacted Files	Coverage Δ
superset/models/dashboard.py	75.87% <30.00%> (-2.11%)	⬇️
superset/connectors/connector_registry.py	78.68% <40.00%> (-7.59%)	⬇️
superset/dashboards/commands/importers/v0.py	89.94% <64.70%> (-2.92%)	⬇️
superset/connectors/base/models.py	88.49% <75.00%> (-0.22%)	⬇️
superset/db_engines/hive.py	0.00% <0.00%> (-82.15%)	⬇️
superset/db_engine_specs/hive.py	69.20% <0.00%> (-17.21%)	⬇️
superset/db_engine_specs/presto.py	83.36% <0.00%> (-6.95%)	⬇️
superset/views/database/mixins.py	81.03% <0.00%> (-1.73%)	⬇️
superset/connectors/sqla/models.py	88.15% <0.00%> (-1.66%)	⬇️
superset/db_engine_specs/base.py	87.97% <0.00%> (-0.41%)	⬇️
... and 2 more

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