add some sql server rules

2、add paren on some rule

add postgre expr

add postgre table and index rule

Merge branch 'sharding-jdbc-ddl-parser' of https://github.com/sharding-sphere/sharding-sphere into sharding-jdbc-ddl-parser

add sqlserver create index

add storageParametersWithParen rule

fix test bug

add alter table statement

organize g4 files with antlr plugin style

use jdk1.8 build

support create select
optimize code structure