[FLINK-38110] fix PostgreSQL connector reads Chinese columns with garbled charactor #4128
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This closes https://issues.apache.org/jira/browse/FLINK-38110
When there's column name in Chinese in PG tables, Postgresql connector with pgoutput plugin will decode them as garbled characters, especially during incremental capure.
The reason is when handling column names and table names,
io.debezium.connector.postgresql.connection.pgoutput.PgOutputMessageDecoder
doesn't convert the String to utf8 charset,
This pr copied PgOutputMessageDecoder from debezium and add a new method readUTF8String(ByteBufer bytebuffer)
and use the method when decoding column names.
Unit test is supplemented for this case.