[feature](tracing) Support query tracing to improve doris observability by introducing OpenTelemetry. (#10533)

The collection of query traces is implemented in fe and be, and the spans are exported to zipkin.
DSIP: https://cwiki.apache.org/confluence/display/DORIS/DSIP-012%3A+Introduce+opentelemetry

be/src/exec/exec_node.cpp

@@ -149,6 +149,7 @@ ExecNode::ExecNode(ObjectPool* pool, const TPlanNode& tnode, const DescriptorTbl
           _rows_returned_counter(nullptr),
           _rows_returned_rate(nullptr),
           _memory_used_counter(nullptr),
+          _get_next_span(),
           _is_closed(false) {}
 
 ExecNode::~ExecNode() {}