Add show create database statement

[junnplus]

I hereby agree to the terms of the CLA available at: https://databend.rs/policies/cla/

Summary

Summary about this PR

Changelog

• New Feature

Related Issues

Fixes #3561

Test Plan

• Unit Tests
• Stateless Tests

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[codecov-commenter]

Codecov Report

Merging #3573 (e0bb8ab) into main (5f56470) will increase coverage by 0%.
The diff coverage is 66%.

@@          Coverage Diff          @@
##            main   #3573   +/-   ##
=====================================
  Coverage     61%     61%           
=====================================
  Files        631     634    +3     
  Lines      34921   34983   +62     
=====================================
+ Hits       21308   21398   +90     
+ Misses     13613   13585   -28     

Impacted Files	Coverage Δ
common/planners/src/plan_node.rs	45% <0%> (-1%)	⬇️
common/planners/src/plan_rewriter.rs	45% <0%> (-1%)	⬇️
query/src/catalogs/impls/immutable_catalog.rs	45% <ø> (ø)
query/src/databases/github/github_database.rs	0% <0%> (ø)
query/src/interpreters/interpreter_factory.rs	36% <0%> (-3%)	⬇️
query/src/sql/sql_statement.rs	33% <0%> (-1%)	⬇️
common/planners/src/plan_show_create_database.rs	42% <42%> (ø)
query/src/databases/database.rs	75% <66%> (-25%)	⬇️
...c/sql/statements/statement_show_create_database.rs	75% <75%> (ø)
query/src/databases/system/system_database.rs	91% <83%> (ø)
... and 11 more

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[BohuTANG]

/lgtm

Thank you @junnplus !

[databend-bot]

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