Unified rename DefaultSchema to DefaultDatabase

[zhaojinchao95]

For #14004

[codecov-commenter]

Codecov Report

Merging #17452 (82d3019) into master (3ebf514) will increase coverage by 0.00%.
The diff coverage is 26.31%.

@@            Coverage Diff            @@
##             master   #17452   +/-   ##
=========================================
  Coverage     59.04%   59.04%           
  Complexity     2107     2107           
=========================================
  Files          3552     3552           
  Lines         53041    53041           
  Branches       9057     9057           
=========================================
+ Hits          31316    31319    +3     
+ Misses        19083    19080    -3     
  Partials       2642     2642           

Impacted Files	Coverage Δ
...re/driver/api/ShardingSphereDataSourceFactory.java	0.00% <0.00%> (ø)
.../api/yaml/YamlShardingSphereDataSourceFactory.java	50.00% <0.00%> (ø)
...ource/metadata/ShardingSphereDatabaseMetaData.java	85.45% <0.00%> (ø)
...ore/resultset/ShardingSphereResultSetMetaData.java	15.55% <0.00%> (ø)
...gsphere/spring/boot/schema/DatabaseNameSetter.java	83.33% <0.00%> (ø)
...end/communication/DatabaseCommunicationEngine.java	26.47% <0.00%> (ø)
...rdingsphere/transaction/ConnectionTransaction.java	46.15% <75.00%> (ø)
.../dbdiscovery/route/DatabaseDiscoverySQLRouter.java	95.00% <100.00%> (ø)
...r/jdbc/core/statement/ShardingSphereStatement.java	51.11% <100.00%> (ø)
...d/text/distsql/ral/common/hint/HintSourceType.java	42.85% <0.00%> (+42.85%)	⬆️

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