feat: Allows dynamic type on viz migrations

[michael-s-molina]

SUMMARY

This PR modifies the viz migration base class to allow the target viz type to be defined dynamically during the migration itself. This is a prerequisite for some types of migrations such as the NVD3 Line chart which can be migrated into different ECharts charts such as Line, Smooth Line, Stepped Line, etc.

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

Merging #23975 (f1a7b48) into master (b4371f6) will increase coverage by 0.02%.
The diff coverage is 94.46%.

❗ Current head f1a7b48 differs from pull request most recent head 5e9fe8d. Consider uploading reports for the commit 5e9fe8d to get more accurate results

@@            Coverage Diff             @@
##           master   #23975      +/-   ##
==========================================
+ Coverage   68.15%   68.18%   +0.02%     
==========================================
  Files        1941     1941              
  Lines       75212    75213       +1     
  Branches     8158     8153       -5     
==========================================
+ Hits        51262    51284      +22     
+ Misses      21867    21848      -19     
+ Partials     2083     2081       -2     

Flag	Coverage Δ
hive	53.17% <96.48%> (-0.01%)	⬇️
mysql	78.90% <98.99%> (?)
postgres	78.97% <98.99%> (-0.01%)	⬇️
presto	53.09% <96.48%> (-0.01%)	⬇️
python	82.75% <98.99%> (+0.04%)	⬆️
sqlite	77.49% <98.99%> (-0.01%)	⬇️
unit	52.98% <96.48%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
superset-frontend/src/SqlLab/App.jsx	0.00% <ø> (ø)
...frontend/src/components/DatabaseSelector/index.tsx	91.07% <ø> (-0.46%)	⬇️
...et-frontend/src/components/TableSelector/index.tsx	78.37% <ø> (ø)
...uperset-frontend/src/hooks/apiResources/schemas.ts	50.00% <ø> (-42.31%)	⬇️
superset-frontend/src/hooks/apiResources/tables.ts	80.00% <ø> (-4.22%)	⬇️
superset-frontend/src/views/App.tsx	0.00% <ø> (ø)
superset-frontend/src/views/store.ts	78.26% <ø> (ø)
superset/datasource/api.py	100.00% <ø> (ø)
superset/db_engine_specs/ocient.py	57.28% <0.00%> (ø)
...d/src/SqlLab/components/TabbedSqlEditors/index.jsx	50.00% <50.00%> (+0.52%)	⬆️
... and 48 more

... and 3 files with indirect coverage changes

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[rusackas]

Thanks for clarifying things on Slack about the test coverage (happening via the individual migration PRs), and the clarity on granularity_sqla (terrible name / refactor ahead). This otherwise makes sense to me... let's do it!