Upgrade clang-tidy on CI. (#5469)

* Correct all clang-tidy errors.
* Upgrade clang-tidy to 10 on CI.

Co-authored-by: Hyunsu Cho <chohyu01@cs.washington.edu>

src/common/probability_distribution.h

@@ -59,6 +59,7 @@ class ProbabilityDistribution {
    * \return Reference to the newly created probability distribution object
    */
   static ProbabilityDistribution* Create(ProbabilityDistributionType dist);
+  virtual ~ProbabilityDistribution() = default;
 };
 
 /*! \brief The (standard) normal distribution */