Attach type to expression generation rule

[albertZhangTJ]

The testers shall specify the expressions (or say, values) in a single production rule using alternatives. Each branch at the top level of the alternative shall be associated with a type (matching the datatype in target DBMS).

For example

expr : ( quot (character)+ quot { E_TYPE("TEXT"); } | (digit)+ { E_TYPE("INT"); } ) ;

[albertZhangTJ]

Steps to achieve this including

• Add LancerFuzz internal support for the extra info (in RuleNode.java)
• Add specification processing
• Add fuzzer source code template
• Update fuzzer rendering
• Optionally check the structure of the expression node

[albertZhangTJ]

Done with 47a063cdbf3dfe221c4b833dadd5fc30acdd8fac