* refactor orchestration apollo properties with TypedProperties class.

* refactor orchestration nacos properties with TypedProperties class.

* refactor orchestration Zookeeper properties with TypedProperties class.

* refactor orchestration common properties with TypedProperties class.

* refactor orchestration facade overwrite properties with OrchestrationProperties class.

* fixes orchestration properties String default value.

* fixes orchestration Zookeeper properties key name.

* add Apache license.

* add orchestration enum properties comment.

* Support SET TRANSACTION for SQLServer with visitor

* Delete useless VisitorSQLParserTestCasesRegistryFactory

* Support DCL for SQLServer with visitor

* Support CREATE TABLE for Oracle visitor

* Support CREATE TABLE for Oracle visitor

* skip unsupported test cases

* Support ALTER INDEX

* Support ALTER TABLE

* refactor properties to support non-string types

* complete unit test for ShardingSphereProperties

* complete unit test for ShardingSphereProperties

* polish generic type

* fix testcase in sharding-jdbc-spring

* Polish code style & class name

* remove a blank line

* support parsing multiple parameter-marker from one expr

* delete annotation

* update performance tool

* update performance doc

* fix test cases for SET

* fix test cases for SHOW

* fix test cases for ALTER ROLE

* fix test cases for alter table

* add distinct for pg

* remove cases temporary

* ignore checkstyle temporary

* ignore test cases temporary

* refactor ALTER TABLE for MySQL

* Support ALTER TABLE for PostgreSQL

* solve parser conflicts and delete duplicated sql cases.

* check style

* #4278 Add log details for metadata load when app startup

* #4278 modify log content.

* Fixes #4037 in 5.x for #4193 in 4.0.1

* reset the code format

* refactor create table for MySQL

* Support create table for PostgreSQL

* Process LIMIT ALL for PostgreSQL

* Add test case

* 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