fix: use risingwave as the sqlalchemy_uri_placeholder prefix for RisingWave engine

[hzxa21]

SUMMARY

Prior to this PR, when user choose RisingWave as the db engine, it will display postgresql://... as the sqlalchemy uri placeholder. However, this may cause issues when browsing the dataset because there are unsupported functionalities. Based on the official doc, risingwave:://... should be used so that sqlalchemy-risingwave will be chosen to be the driver.

This PR modifies the sqlalchemy_uri_placeholder for RisingWave engine and adds optional dependency for risingwave in pyproject.toml

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

[korbit-ai]

I've completed my review and didn't find any issues.

Files scanned

​

File Path	Reviewed
superset/db_engine_specs/risingwave.py	✅

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[github-actions]

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[rusackas]

LGTM, but cc @betodealmeida to make sure I'm not missing some detail(s). Looks like the docs are up to date, which is nice :D

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.96%. Comparing base (76d897e) to head (95af377).
Report is 1964 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #33764       +/-   ##
===========================================
+ Coverage   60.48%   72.96%   +12.47%     
===========================================
  Files        1931      558     -1373     
  Lines       76236    40293    -35943     
  Branches     8568     4223     -4345     
===========================================
- Hits        46114    29399    -16715     
+ Misses      28017     9803    -18214     
+ Partials     2105     1091     -1014     

Flag	Coverage Δ
hive	47.22% <100.00%> (-1.94%)	⬇️
javascript	?
mysql	71.95% <100.00%> (?)
postgres	72.01% <100.00%> (?)
presto	50.97% <100.00%> (-2.83%)	⬇️
python	72.92% <100.00%> (+9.42%)	⬆️
sqlite	71.52% <100.00%> (?)
unit	100.00% <ø> (+42.36%)	⬆️

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