* Decouple AuthenticationEngine and BackendConnection

* Decouple AuthenticationEngine and BackendConnection

* Unify userName to username

* Refactor CommandExecutorTask

* Refactor MySQLComQueryPacketExecutor.isQueryResponse

* Refactor MySQLComStmtExecuteExecutor.isQueryResponse

* Refactor PostgreSQLComBindExecutor.isQueryResponse

* Refactor PostgreSQLComQueryExecutor.isQueryResponse

* Refactor OrderedSPIRegistry

* Make field as local if possible

* Add @SuppressWarnings("unchecked")

* Remove redundant throws

* Remove assertEquals

* Add genertic type

* For checkstyle

* For spell error

* For code style

* Fix test cases

* Unify properties and props

* Unify properties and props

* Merge branch 'master' into dev

# Conflicts:
#	shardingsphere-features/shardingsphere-sharding/shardingsphere-sharding-common/src/main/java/org/apache/shardingsphere/sharding/strategy/algorithm/sharding/ModuloShardingAlgorithm.java
#	shardingsphere-features/shardingsphere-sharding/shardingsphere-sharding-route/src/main/java/org/apache/shardingsphere/sharding/route/engine/type/standard/ShardingStandardRoutingEngine.java
#	shardingsphere-proxy/shardingsphere-proxy-bootstrap/src/main/java/org/apache/shardingsphere/proxy/Bootstrap.java

* Removing ShardingSphereProxyContext is underway

* delete blank line

* Rename AbstractShardingJDBCDatabaseAndTableTest to AbstractShardingSphereDataSourceForShardingTest

* Rename AbstractShadowJDBCDatabaseAndTableTest to AbstractShardingSphereDataSourceForShadowTest

* Rename AbstractMasterSlaveJDBCTest to AbstractShardingSphereDataSourceForMasterSlaveTest

* Rename AbstractEncryptJDBCDatabaseAndTableTest to AbstractShardingSphereDataSourceForEncryptTest

* Rename ShardingProxyContext to ShardingSphereProxyContext

* Rename sharding-proxy to shardingsphere-proxy

* rename org.apache.shardingsphere.shardingproxy to org.apache.shardingsphere.proxy

* Rename shardingsphere-underlying to shardingsphere-infra

* Rename shardingsphere-infra's subprojects

* Rename shardingsphere-infra's subprojects

* rename package from org.apache.shardingsphere.underlying.common to org.apache.shardingsphere.infra

* rename package from org.apache.shardingsphere.underlying.executor to org.apache.shardingsphere.infra.executor

* rename package from org.apache.shardingsphere.underlying.merge to org.apache.shardingsphere.infra.merge

* rename package from org.apache.shardingsphere.underlying.route to org.apache.shardingsphere.infra.route

* rename package from org.apache.shardingsphere.underlying.rewrite to org.apache.shardingsphere.infra.rewrite

* rename shardingsphere-database-protocol to shardingsphere-db-protocol

* rename package org.apache.shardingsphere.database to org.apache.shardingsphere.db

* rename ShardingSphereProperties to ConfigurationProperties

* rename PropertiesConstant to ConfigurationPropertyKey

* rename ConfigurationProperties and OrchestrationProperties

* move OrchestrationProperties to sharding-orchestration-core-facade module

* move ConfigurationProperties to config package

* rename impl of TypedPropertyKey

* move ConfigurationPropertiesTest

* Rename org.apache.shardingsphere.underlying.common.constant.properties to org.apache.shardingsphere.underlying.common.properties

* move TypedProperties to basic package

* refactor package org.apache.shardingsphere.underlying.common.properties

* rename TypedProperties.enumClass to keyClass

* private TypedProperties.find()

* refactor TypedProperties

* fix test case

* remove TypedProperties.keyClass

* fix test case

* move sharding-proxy-transport to shardingsphere-database-protocol

* rename sharding-proxy-transport to shardingsphere-database-protocol for maven module

* rename org.apache.shardingsphere.shardingproxy.transport to org.apache.shardingsphere.database.protocol

This reverts commit 88de2f07.

Merger master into orchestration 5.x