Added a Q# example testing ref. counting mechanism

#include <iostream> 

#include <vector>

#include "qir-types-utils.hpp"

// Include the external QSharp function.

qcor_include_qsharp(QCOR__TestKernel__body, ::Array*);

qcor_include_qsharp(QCOR__TestClean__body, void);

// Compile with:

// Include both the qsharp source and this driver file

// in the command line.

// $ qcor -qrt ftqc kernel.qs driver.cpp

// Run with:

// $ ./a.out

int main() {

  // Kernel that clean-up all allocated objects.

  QCOR__TestClean__body();

  // No leak expected.

  assert(!qcor::internal::AllocationTracker::get().checkLeak());

  // This kernel returns an Array,

  // (allocated in the kernel body)

  auto test = QCOR__TestKernel__body();

  const auto resultVec = qcor::qir::fromArray<double>(test);

  // Should detect a leak.

  assert(qcor::internal::AllocationTracker::get().checkLeak());

  for (const auto &el : resultVec) {

    std::cout << el << "\n";

  }

  // Release the ref-count of the returned array.

  // This should dealloc the Array

  test->release_ref();

  // No leak expected.

  assert(!qcor::internal::AllocationTracker::get().checkLeak());

  return 0;

}

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namespace QCOR 

{ 

operation TestClean() : Unit {

    // Arrays

    let test1 = [1.0, 2.0];

    let test2 = [1, 2, 3, 4];

    // Tuples

    let test4 = (1.0, [2, 3, 4]);

}

operation TestKernel() : Double[] {

    // Arrays

    let test1 = [1.0, 2.0];

    let test2 = [1, 2, 3, 4];

    // Tuples

    let test4 = (1.0, [2, 3, 4]);

    // Return an array

    return [5.0, 6.0, 7.0];

}

}

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