MAINT: Add assignment operators for Input and Parameter classes of solvers

cpp/daal/include/algorithms/optimization_solver/adagrad/adagrad_types.h

@@ -137,6 +137,7 @@ class DAAL_EXPORT Input : public optimization_solver::iterative_solver::Input
     typedef optimization_solver::iterative_solver::Input super;
     Input();
     Input(const Input & other);
+    Input & operator=(const Input & other);
 
     using super::set;
     using super::get;

cpp/daal/src/algorithms/optimization_solver/adagrad/adagrad_types.cpp

@@ -66,6 +66,10 @@ services::Status Parameter::check() const
 
 Input::Input() {}
 Input::Input(const Input & other) {}
+Input & Input::operator=(const Input & other)
+{
+    return *this;
+};
 
 data_management::NumericTablePtr Input::get(OptionalDataId id) const
 {