Refactor sharding example with ShardingSphereDriver

[Pace2Car]

For #22469.

Changes proposed in this pull request:

• Refactor configuration to use ShardingSphereDriver
• Remove Spring configuration example

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• My code follows the code of conduct of this project.
• I have self-reviewed the commit code.
• I have (or in comment I request) added corresponding labels for the pull request.
• I have passed maven check locally : ./mvnw clean install -B -T1C -Dmaven.javadoc.skip -Dmaven.jacoco.skip -e.
• I have made corresponding changes to the documentation.
• I have added corresponding unit tests for my changes.

[RaigorJiang]

@Pace2Car Thank you!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.98%. Comparing base (38f7e45) to head (87f99f6).
Report is 8036 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #22513      +/-   ##
============================================
- Coverage     51.05%   50.98%   -0.08%     
- Complexity     2512     2514       +2     
============================================
  Files          4179     4185       +6     
  Lines         58109    58237     +128     
  Branches       9891     9902      +11     
============================================
+ Hits          29670    29691      +21     
- Misses        25911    26016     +105     
- Partials       2528     2530       +2     

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