[DOC] Running the Thrift JDBC/ODBC server with CarbonExtensions
[DOC] Running the Thrift JDBC/ODBC server with CarbonExtensions

Why is this PR needed?
since version 2.0, carbon supports starting spark ThriftServer with CarbonExtensions.

What changes were proposed in this PR?
add the document to start spark ThriftServer with CarbonExtensions.

Does this PR introduce any user interface change?
No

Is any new testcase added?
No

This closes #4077

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