feat(database): Add OceanBase support

[yuanoOo]

SUMMARY

OceanBase is an enterprise-level open source distributed relational database with high availability, high performance, horizontal scalability, and compatibility with SQL standards.
Although OceanBase is compatible with the MySQL protocol, there are still some differences in data types, SQL syntax, etc.

https://en.oceanbase.com/docs/common-oceanbase-database-10000000001375342
https://en.oceanbase.com/docs/common-oceanbase-database-10000000001375338

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

• after
  

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

[github-actions]

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[yuanoOo]

@john-bodley Can you take a look in your free time.

[zhaoyongjie]

@yuanoOo please adding license header in new files, ping me please if you need helping. Thanks for your contributions!

[codecov]

Codecov Report

Attention: Patch coverage is 95.12195% with 2 lines in your changes missing coverage. Please review.

Project coverage is 70.57%. Comparing base (76d897e) to head (2c8fe4b).
Report is 966 commits behind head on master.

Files with missing lines	Patch %	Lines
superset/db_engine_specs/oceanbase.py	95.12%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #29496       +/-   ##
===========================================
+ Coverage   60.48%   70.57%   +10.08%     
===========================================
  Files        1931     1968       +37     
  Lines       76236    79255     +3019     
  Branches     8568     8972      +404     
===========================================
+ Hits        46114    55934     +9820     
+ Misses      28017    21123     -6894     
- Partials     2105     2198       +93     

Flag	Coverage Δ
hive	49.27% <95.12%> (+0.10%)	⬆️
javascript	58.05% <ø> (+0.33%)	⬆️
mysql	77.05% <95.12%> (?)
postgres	77.42% <95.12%> (?)
presto	54.06% <95.12%> (+0.26%)	⬆️
python	83.89% <95.12%> (+20.41%)	⬆️
sqlite	76.92% <95.12%> (?)
unit	59.90% <95.12%> (+2.27%)	⬆️

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[yuanoOo]

@yuanoOo please adding license header in new files, ping me please if you need helping. Thanks for your contributions!

@zhaoyongjie Thanks for the reminder, I've fixed it. Can you help trigger the github workflow again?

[yuanoOo]

@zhaoyongjie @rusackas Hi, After my review, the reason for the failure of GitHub Workflow does not seem to be related to this PR.
But I'm not sure, can you help me check it out? Thanks.

[zhaoyongjie]

@yuanoOo I've retriggered the CI.

[zhaoyongjie]

LGTM