feat(database): add databricks oauth support

[drummerwolli]

SUMMARY

OAuth 2.0 support for Databricks

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

tbd

TESTING INSTRUCTIONS

• set up oauth config in superset_config.py for databricks as described in the newly added docs
• install databricks dependencies
• run superset
• set up a DB connection to Databricks
• run a Query with that newly created connection and notice the Oauth login screen.

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

[korbit-ai]

Review by Korbit AI

Korbit automatically attempts to detect when you fix issues in new commits.

Category	Issue	Status
	Duplicated OAuth2 Configuration ▹ view	✅ Fix detected
	OAuth Client Secrets Exposed in Config File ▹ view	🧠 Incorrect
	Hardcoded OAuth2 endpoints limit cloud provider support ▹ view	✅ Fix detected

Files scanned

​

File Path	Reviewed
superset/db_engine_specs/databricks.py	✅
docs/docs/configuration/databases.mdx	✅

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[codecov]

Codecov Report

❌ Patch coverage is 39.34426% with 37 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.17%. Comparing base (76d897e) to head (0b786fc).
⚠️ Report is 3252 commits behind head on master.

Files with missing lines	Patch %	Lines
superset/db_engine_specs/databricks.py	39.34%	37 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #34619       +/-   ##
===========================================
+ Coverage   60.48%   72.17%   +11.68%     
===========================================
  Files        1931      574     -1357     
  Lines       76236    41921    -34315     
  Branches     8568     4424     -4144     
===========================================
- Hits        46114    30256    -15858     
+ Misses      28017    10483    -17534     
+ Partials     2105     1182      -923     

Flag	Coverage Δ
hive	46.99% <39.34%> (-2.16%)	⬇️
javascript	?
mysql	71.68% <39.34%> (?)
postgres	71.75% <39.34%> (?)
presto	50.68% <39.34%> (-3.12%)	⬇️
python	72.13% <39.34%> (+8.63%)	⬆️
sqlite	71.30% <39.34%> (?)
unit	?

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[drummerwolli]

I'm currently testing this internally and will report back here, hence there might not be any visible activity in this PR in the next days.