* Set default readOnly value to false

* fix ci error

* #4406 fix MySQL, PostgreSQL DDL cannot parse Integer, Double, Decimal

* #4459 Correct the `DataTypeName` for mysql

# Conflicts:
#	shardingsphere-sql-parser/shardingsphere-sql-parser-mysql/src/main/java/org/apache/shardingsphere/sql/parser/visitor/impl/MySQLDDLVisitor.java
#	shardingsphere-sql-parser/shardingsphere-sql-parser-oracle/src/main/java/org/apache/shardingsphere/sql/parser/visitor/impl/OracleDDLVisitor.java
#	shardingsphere-sql-parser/shardingsphere-sql-parser-postgresql/src/main/java/org/apache/shardingsphere/sql/parser/visitor/impl/PostgreSQLDDLVisitor.java
#	shardingsphere-sql-parser/shardingsphere-sql-parser-sql92/src/main/java/org/apache/shardingsphere/sql/parser/visitor/impl/SQL92DDLVisitor.java
#	shardingsphere-sql-parser/shardingsphere-sql-parser-sqlserver/src/main/java/org/apache/shardingsphere/sql/parser/visitor/impl/SQLServerDDLVisitor.java

* remove createDefinitions from MySQL g4

* add CreateDefinitionSegment

* rename rule name inside columnDefinition

* parse referencedTables on ColumnDefinitionSegment

* parse ConstraintDefinitionSegment on DefinitionSegment

* refactor CreateTable with CreateDefinitionSegment for MySQL

* refactor CreateTable with CreateDefinitionSegment for PostgreSQL

* refactor CreateTable with CreateDefinitionSegment for Oracle

* refactor CreateTable with CreateDefinitionSegment for SQLServer

* refactor CreateTable with CreateDefinitionSegment for SQL92

* fix parser test cases

* update docs of performance test

* update docs of perfomance test

* Modify AliasAvailable

* Modify dataTypeName

* Remove useless getAllSQLSegments().add(XXX) for DML

* Remove useless getAllSQLSegments().add(XXX) for DAL

* Remove useless getAllSQLSegments().add(XXX) for MySQL

* Remove useless getAllSQLSegments().add(XXX) for Oracle

* Remove useless getAllSQLSegments().add(XXX) for PostgreSQL

* Remove useless getAllSQLSegments().add(XXX) for SQL92

* Remove useless getAllSQLSegments().add(XXX) for SQLServer

* Remove useless getAllSQLSegments() on test case

* Decouple TableTokenGenerator and SQLStatement.getAllSQLSegments()

* Parse variable name for SET statement

* #4255, column definition information for mysql_stmt_prepare

* #4255, for comments

Replace Alias member of all the ExpressionProjectionSegment and AggregationProjectionSegment with Alias segment. (#4449)

* comment code about subquery

* remove SQLStatement.findSQLSegment and SQLStatement.findSQLSegments

* Add delete branch contribution guide to doc

* Modify 'shardingsphere' to 'ShardingSphere'

* modify TableTokenGenerator

* check style

* Use rule name instead of parse tree class for ParseTreeVisitorFactory

* add test case for rule name

* refactor SQLParserEngine

* refactor SQLParserEngine

* refactor SQLParser

* swap SQLParserEngine and SQLParserKernel

* use SQLParseEngine instead of SQLParserEngine in TextProtocolBackendHandlerFactory

* remove SQLParserEngine

* rename SQLParseEngine to SQLParserEngine

* rename SQLParseEngineFactory to SQLParserEngineFactory

* rename SQLParserKernel to SQLParserExecutor

* rename SQLParserEntry to SQLParserConfiguration

* remove useless extractor

* remove useless filler

* remove useless ParseRuleRegistry

* remove useless rule

* remove useless ExtractorUtils

* remove useless SQLAST

* refactor return value of SQLParserEngine.parse() from ParserRuleContext to ParseTree

* refactor SQLParseKernel

* move NewInstanceServiceLoader.register(SQLParserEntry.class) to SQLParserFactory

* Filter alias's owner of join table

* fix test case

* Transfer SQL parser engine to new one