fix: add missing init on python pkg key_value

[dpgaspar]

SUMMARY

Adds missing __init__.py on key_value pkg

Getting:

  File "/usr/local/lib/python3.8/site-packages/superset/views/access_requests.py", line 25, in <module>
    from superset.views.core import DAR
  File "/usr/local/lib/python3.8/site-packages/superset/views/core.py", line 74, in <module>
    from superset.dashboards.permalink.commands.get import GetDashboardPermalinkCommand
  File "/usr/local/lib/python3.8/site-packages/superset/dashboards/permalink/commands/get.py", line 28, in <module>
    from superset.key_value.commands.get import GetKeyValueCommand
ModuleNotFoundError: No module named 'superset.key_value.commands'

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

[villebro]

😱 How did this not get picked up earlier?? Thanks for fixing!

[codecov]

Codecov Report

Merging #19428 (f8e309d) into master (a8e7624) will decrease coverage by 0.05%.
The diff coverage is 60.00%.

❗ Current head f8e309d differs from pull request most recent head 458affe. Consider uploading reports for the commit 458affe to get more accurate results

@@            Coverage Diff             @@
##           master   #19428      +/-   ##
==========================================
- Coverage   66.59%   66.53%   -0.06%     
==========================================
  Files        1670     1670              
  Lines       63884    63888       +4     
  Branches     6510     6510              
==========================================
- Hits        42542    42509      -33     
- Misses      19653    19690      +37     
  Partials     1689     1689              

Flag	Coverage Δ
hive	52.64% <0.00%> (-0.27%)	⬇️
mysql	81.89% <60.00%> (-0.01%)	⬇️
postgres	81.94% <60.00%> (-0.01%)	⬇️
presto	?
python	82.26% <60.00%> (-0.12%)	⬇️
sqlite	81.71% <60.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
superset/key_value/commands/create.py	93.47% <ø> (ø)
superset/key_value/commands/update.py	89.36% <ø> (ø)
superset/dashboards/permalink/commands/create.py	89.65% <50.00%> (-2.94%)	⬇️
superset/explore/permalink/commands/create.py	90.62% <50.00%> (-2.71%)	⬇️
superset/key_value/commands/upsert.py	89.58% <100.00%> (ø)
superset/db_engine_specs/presto.py	84.30% <0.00%> (-4.82%)	⬇️
superset/connectors/sqla/models.py	88.28% <0.00%> (-1.03%)	⬇️
superset/models/core.py	88.80% <0.00%> (-0.24%)	⬇️

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[dpgaspar]

😱 How did this not get picked up earlier?? Thanks for fixing!

No problem, thks for the review