[flink] Fail fast on batch virtual log table reads

[QuakeWang]

Purpose

Linked issue: close #3144

Batch reads on $binlog and $changelog virtual tables could pass source creation and fail later in the source coordinator with an internal lake-source error. These virtual log tables are currently log-only and only support streaming mode.

Brief change log

• Reject batch runtime mode in $binlog and $changelog table source creation.
• Return a clear UnsupportedOperationException before job submission.
• Add factory and planner-path tests for both virtual table types.

Tests

• mvn -B -ntp -Dskip.on.java8=true -DfailIfNoTests=false -pl fluss-flink/fluss-flink-1.20 -am -Dtest=Flink120TableFactoryTest test
• mvn -B -ntp -Dskip.on.java8=true -DfailIfNoTests=false -pl fluss-flink/fluss-flink-1.20 -am -Dtest=Flink120BinlogVirtualTableITCase,Flink120ChangelogVirtualTableITCase test

API and Format

Documentation