Flink Doris Connector

[hf200012]

Refer to Spark Doris Connector test method Flink Connector

1. Support reading doris data through Flink to construct DataStream
2. Support to create Flink table mapping doris table through Flink SQL to read doris data, example:
   CREATE TABLE myUserTable (
   user_id STRING,
   user_name STRING
   uv BIGINT,
   pv BIGINT,
   PRIMARY KEY (user_id) NOT ENFORCED
   ) WITH (
   'connector' ='doris',
   'fe.host' ='ip:port',
   'username' ='users',
   'password' ='password',
   'tableName' ='table1'
   );

[hf200012]

Supports reading doris data through Flink to build DataStream, development is completed, testing, the code is recently submitted to the community