* add sync new code framework

* complete manage module

* complete all sender module

* complete sync sender module

* complete sync receiver end

* complete load module in receiver end

* add load log and clean up in receiver end

* add sync log recovery in receiver end

* add sync sender log analyzer

* complete load tsfiles module

* add snapshot unit test

* add load tsfile unit test

* add log analyzer unit test

* finish file renaming for loaded sequence tsfiles

* fix an acute bug due to unmodifiable variable publishing

* fix some acute bug in testing

* fix a bug in windows environment

* modify log level fron info to error

* add default properties

* replace interface with concrete class

* add definition about appropriate

* update memory estimation tool doc

* fix a bug of ip issue

* fix issues according to pr reviews

* add reject policy while there are two sender sync data of the same device to the same receiver

* Add documents for Query History Visualization Tool

* separate MetaDataPlan and MetaDataOperator to make them clear

* reduce IO in constructing chunk header

* support time expression

* support reading v0.8.0 TsFile in 0.9.0

* update error info of querying non-existent path

* modify the cal equation of memtable threshold

* improve query result dataset structure TSQueryDataSet

* check path validity in session

New doc pr

* modify config files

* complete the task

* modify insertion using MetadataPlan

* modify import exceptions

* modify IoTDBAutoCreateSchemaIT

* modify getNodeByDeviceIdFromCache

* reconstruct tql parser and lexer

* display cache hit rate through jconsole

* modify pr review

* Log configuration file for iotdb are loaded dynamically every 60s

* modify pr review

* remove jdk version constrain for jdk8 and 11. (now only jdk<1.8u40 is forbidden)

* add apache-rat for .checkstyle file