feat: external management flags in CRUD

[betodealmeida]

SUMMARY

Add is_managed_externally and external_url to the POST/PUT schemas for all resources that have the columns (databases, datasets, charts, dashboards). This allows us to create resources that are flagged as manged externally, as well as update existing ones.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

N/A

TESTING INSTRUCTIONS

WIP, adding unit tests.

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 #19318 (f0fd7ed) into master (7ca10fb) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master   #19318   +/-   ##
=======================================
  Coverage   66.65%   66.66%           
=======================================
  Files        1672     1672           
  Lines       64611    64627   +16     
  Branches     6505     6505           
=======================================
+ Hits        43066    43082   +16     
  Misses      19862    19862           
  Partials     1683     1683           

Flag	Coverage Δ
hive	52.67% <100.00%> (+0.02%)	⬆️
mysql	81.66% <100.00%> (+<0.01%)	⬆️
postgres	81.71% <100.00%> (+<0.01%)	⬆️
presto	52.52% <100.00%> (+0.02%)	⬆️
python	82.13% <100.00%> (+<0.01%)	⬆️
sqlite	81.48% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
superset/charts/schemas.py	99.34% <100.00%> (+<0.01%)	⬆️
superset/dashboards/schemas.py	99.43% <100.00%> (+0.01%)	⬆️
superset/databases/schemas.py	98.50% <100.00%> (+0.02%)	⬆️
superset/datasets/schemas.py	97.26% <100.00%> (+0.07%)	⬆️

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