feat: support show create table

[dl239]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• What is the current behavior? (You can also link to an open issue here)

• What is the new behavior (if this is a feature change)?

[codecov]

Codecov Report

Attention: 74 lines in your changes are missing coverage. Please review.

Comparison is base (b7d6edc) 37.14% compared to head (72c2080) 75.33%.
Report is 15 commits behind head on main.

Additional details and impacted files

@@              Coverage Diff              @@
##               main    #3500       +/-   ##
=============================================
+ Coverage     37.14%   75.33%   +38.18%     
  Complexity      414      414               
=============================================
  Files           179      708      +529     
  Lines         10364   128708   +118344     
  Branches       1191     1191               
=============================================
+ Hits           3850    96957    +93107     
- Misses         6273    31510    +25237     
  Partials        241      241               

Files	Coverage Δ
hybridse/src/planv2/ast_node_converter.cc	94.38% <ø> (ø)
hybridse/src/node/sql_node.cc	76.46% <0.00%> (ø)
src/sdk/sql_cluster_router.cc	61.45% <12.50%> (ø)
src/sdk/sdk_util.cc	0.00% <0.00%> (ø)

... and 525 files with indirect coverage changes

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[dl239]

add docs