fix cpp session mem leak

[hongzhi-gao]

Description

Content1

fix cpp sesssion builder memory leak

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This PR has:

• [√] been tested

        try {
            auto builder = std::make_shared<TableSessionBuilder>();
            auto session = std::shared_ptr<TableSession>(builder->username("root")
                    ->password("root")
                    ->nodeUrls(node_urls)
                    ->build());
            session->executeNonQueryStatement("show timeseries");
            session->close();
        }
        catch (const exception &e) {
            printf("exception: %s\n", e.what());
        }

$ valgrind --leak-check=full --show-leak-kinds=all --track-origins=yes ./iotdbapp 
==95960== Memcheck, a memory error detector
==95960== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
==95960== Using Valgrind-3.22.0 and LibVEX; rerun with -h for copyright info
==95960== Command: ./iotdbapp
==95960== 
Thrift: Fri Sep 19 10:37:16 2025 TSocket::open() timed out <Host: 127.0.0.1 Port: 6667>
[WARN]  /home/hongzhi/target/build/main/generated-sources-cpp/NodesSupplier.cpp:209 (fetchLatestEndpoints) - Failed to fetch endpoints from 127.0.0.1:6667 , error=open() timed out
[ERROR] /home/hongzhi/target/build/main/generated-sources-cpp/NodesSupplier.cpp:229 (refreshEndpointList) - NodesSupplier::refreshEndpointList failed: NodesSupplier::fetchLatestEndpoints failed: all nodes unreachable.
Thrift: Fri Sep 19 10:37:17 2025 TSocket::open() timed out <Host: 127.0.0.1 Port: 6667>
[WARN]  /home/hongzhi/target/build/main/generated-sources-cpp/NodesSupplier.cpp:209 (fetchLatestEndpoints) - Failed to fetch endpoints from 127.0.0.1:6667 , error=open() timed out
[ERROR] /home/hongzhi/target/build/main/generated-sources-cpp/NodesSupplier.cpp:229 (refreshEndpointList) - NodesSupplier::refreshEndpointList failed: NodesSupplier::fetchLatestEndpoints failed: all nodes unreachable.
Thrift: Fri Sep 19 10:37:19 2025 TSocket::open() timed out <Host: 127.0.0.1 Port: 6667>
[DEBUG] /home/hongzhi/target/build/main/generated-sources-cpp/SessionConnection.cpp:110 (init) - open() timed out
[DEBUG] /home/hongzhi/target/build/main/generated-sources-cpp/Session.cpp:795 (initDefaultSessionConnection) - open() timed out
[DEBUG] /home/hongzhi/target/build/main/generated-sources-cpp/Session.cpp:950 (open) - open() timed out
exception: open() timed out
==95960== 
==95960== HEAP SUMMARY:
==95960==     in use at exit: 0 bytes in 0 blocks
==95960==   total heap usage: 349 allocs, 349 frees, 106,622 bytes allocated
==95960== 
==95960== All heap blocks were freed -- no leaks are possible
==95960== 
==95960== For lists of detected and suppressed errors, rerun with: -s
==95960== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

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Key changed/added classes (or packages if there are too many classes) in this PR

Modified SessionBuilder to use smart pointers.