* Rename SchemaLoader

* Rename SchemaLoader

* Refactor ShardingSphereMetaDataLoader

* Refactor TableAddressingMapperDataLoader

* Refactor PhysicalSchemaMetaDataLoader

* Refactor test cases

* Refactor PhysicalTableMetaDataLoaderTest

* Refactor PhysicalIndexMetaDataLoaderTest

* Refactor PhysicalColumnMetaDataLoaderTest

* Rename MetaDataLoaderConnectionAdapter

* Rename MetaDataLoaderConnectionAdapter's package

* Rename packages of adapter and dialect

* Remove useless ReplicaQueryTableAddressingMetaDataDecorator

* Switch class name of ShardingSphereMetaData and ShardingSphereSchema

* Adjust seq of ShardingSphereMetaData's constructor

* Remove LogicSchemaMetaData.unconfiguredSchemaMetaDataMap

* Remove LogicSchemaMetaData

* Rename LogicSchemaMetaDataLoader

* Add metadata.schema package

* Fix spi

* Rename SchemaMetaDataLoader

* Rename SchemaMetaDataNotifier

* refactor database dialect get delimiter

* modify java doc

* refactor database dialect get delimiter

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

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

* 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

for #1941, QueryResponsePackets => QueryTransportResponse, CommandResponsePackets => CommandTransportResponse