feat: Add wrapping springql crate

[kazuk]

Issue number and link

Fixes: #192

Describe your changes

• add wrapping crate springql
• re-export springql-core API's from springql

Checklist before requesting a review

• I follow the Semantic Pull Requests rules (bugfix/feature)
• I specified links to related issues (must: bugfix, want: feature)
• I have performed a self-review of my code (bugfix/feature)
• I have added thorough tests (bugfix/feature)
• I have edited ## [Unreleased] section in CHANGELOG.md following keep a changelog syntax (bugfix/feature)
• I {made/will make} a related pull request for documentation repo (feature)

[codecov]

Codecov Report

Merging #193 (87f0518) into main (80b79c4) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #193      +/-   ##
==========================================
+ Coverage   84.68%   84.72%   +0.03%     
==========================================
  Files         210      211       +1     
  Lines       12337    12338       +1     
==========================================
+ Hits        10448    10453       +5     
+ Misses       1889     1885       -4     

Impacted Files	Coverage Δ
springql/tests/e2e_high_level_rs.rs	100.00% <ø> (ø)
springql/tests/e2e_sampling.rs	100.00% <ø> (ø)
springql/tests/feat_aggregation.rs	100.00% <ø> (ø)
springql/tests/feat_error.rs	100.00% <ø> (ø)
springql/tests/feat_join.rs	100.00% <ø> (ø)
springql/tests/feat_logical_ops.rs	100.00% <ø> (ø)
springql/tests/feat_numerical_ops.rs	100.00% <ø> (ø)
springql/tests/feat_performance_metrics_report.rs	100.00% <ø> (ø)
springql/tests/feat_pipeline.rs	100.00% <ø> (ø)
springql/tests/feat_processing_time.rs	100.00% <ø> (ø)
... and 12 more

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[laysakura]

[nits]

[x] I follow the Semantic Pull Requests rules (bugfix/feature)

I changed the pull-request title to follow it.

[laysakura]

• Want to move tests/ and examples/ from springql-core into springql, in order to keep E2E tests
• Want to eliminate duplication in springql-core and springql as much as possible.
  • springql/src/lib.md is duplicate of that of springql-core, for example.

[kazuk]

CI deadlink fail with #196

[laysakura]

💥 🙏 💥

[laysakura]

Ah, sorry. Please fix CI errors.

[laysakura]

📝 example-run is failing due to this issue: #204