* fixes orchestration config listener for nacos and apollo.

* refactor orchestration config for apollo.

* fixes nacos config key name.

* remove Zookeeper unnecessary Properties.

* merge from master, fixes code conflict.

* catch persist method exception.

* use class constant instead of literal.

* revert config file, add default configuration.

* rename unreservedWord_ to unreservedWord

* rename aggregationFunctionName_ to aggregationFunctionName

* rename privilegeClause_ to privilegeClause

* rename onObjectClause_ to onObjectClause

* rename createDefinitionClause_ to createDefinitionClause

* rename alterDefinitionClause_ to alterDefinitionClause

* rename alterDefinitionClause_ to alterDefinitionClause

* Move MySQLVisitor and PostgreSQLVisitor to visitor package

* add @SuppressWarnings("unchecked")

* revert for setvariable of mysql DALStatement.g4

* formart

Merge incubator-shardingsphere-example into incubator-shardingsphere/examples

* add code conduct

* Accurate description

* change comma

* Keep same order with MySQLDCLVisitor and g4 file

* refactor MySQLDCLVisitor

* refactor InsertColumnsSegment's constructor

* inline unnecessary local variable for MySQLTCLVisitor

* inline unnecessary local variable for MySQLDALVisitor

* code style for MySQLDMLVisitor

* code style for MySQLDDLVisitor

* use getter instead of access properties directly

refactor table token and index token, use IdentifierValue to instead of name and quote character (#4241)

* refactor TableAvailable, use IdentifierValue to instead of table name and quote character

* refactor SchemaSegment, use IdentifierValue to instead of name and quote character

* refactor IndexSegment, use IdentifierValue to instead of name and quote character

* refactor ColumnSegment, use IdentifierValue to instead of name and quote character

* decouple FromTableSegment and TableAvailable

* add fromTableSegment and tableSegment to allSQLSegments

* add visitor for setvariable

* fix for code style

* 1.fix set role sql grammar error
2.add set defaulr role grammar visit and xml test

* supplement xml role

* ci test error

* 1.add test object to map and make setRole,setDefaultRole different.
2.modify java file commiter name

* code clean

* add revoke dcl visitor parse and test unit

Orchestration 5.x

copy shardingsphere-doc to shardingsphere/docs

Merge pull request #4221 from sunbufu/orchestration-5.x

* Add new class OtherLiteralValue to decouple StringLiteralValue

* move substring delimiter of string into StringLiteralValue

* add more tests for order-by and or sql

* support using limit pagination

Revert "Merger master into orchestration 5.x"