feat(embedded): API get embedded dashboard config by uuid

[lilykuang]

SUMMARY

• GET embedded config by uuid API endpoint with tests
• validate the creation of guest token with dashboard id or embedded config uuid

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

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 #19650 (5ac9f57) into master (9554135) will decrease coverage by 0.06%.
The diff coverage is 95.77%.

@@            Coverage Diff             @@
##           master   #19650      +/-   ##
==========================================
- Coverage   66.47%   66.41%   -0.07%     
==========================================
  Files        1681     1683       +2     
  Lines       64467    64500      +33     
  Branches     6607     6593      -14     
==========================================
- Hits        42856    42836      -20     
- Misses      19917    19980      +63     
+ Partials     1694     1684      -10     

Flag	Coverage Δ
hive	?
mysql	81.95% <95.77%> (+0.04%)	⬆️
postgres	81.99% <95.77%> (+0.04%)	⬆️
presto	52.54% <64.78%> (+0.02%)	⬆️
python	82.21% <95.77%> (-0.18%)	⬇️
sqlite	81.77% <95.77%> (+0.04%)	⬆️
unit	47.75% <64.78%> (+0.03%)	⬆️

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

Impacted Files	Coverage Δ
superset/embedded/api.py	93.33% <93.33%> (ø)
superset/embedded_dashboard/commands/exceptions.py	100.00% <100.00%> (ø)
superset/initialization/__init__.py	91.72% <100.00%> (+0.05%)	⬆️
superset/security/api.py	96.72% <100.00%> (+0.23%)	⬆️
superset/security/manager.py	95.26% <100.00%> (+0.51%)	⬆️
superset/db_engines/hive.py	0.00% <0.00%> (-85.19%)	⬇️
superset/db_engine_specs/hive.py	70.11% <0.00%> (-15.71%)	⬇️
...tend/src/views/CRUD/data/database/DatabaseList.tsx	67.94% <0.00%> (-1.29%)	⬇️
superset/db_engine_specs/base.py	88.01% <0.00%> (-0.34%)	⬇️
superset/connectors/sqla/models.py	89.27% <0.00%> (-0.19%)	⬇️
... and 9 more

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[suddjian]

looking good!