Add dynamic tensor support to CpuElementwise

The kernels and operators for binary and unary operations
are now capable of being configured with dynamic shapes and
computing windows at run-time.

Additionally, changing arguments' names is done
for consistency.

Partially Implements: COMPMID-4127

Change-Id: I48e5038692db667dec7cb2b2906fe5683214fe19
Signed-off-by: Sang-Hoon Park <sang-hoon.park@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/4973
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Pablo Marquez Tello <pablo.tello@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/core/IKernel.h b/arm_compute/core/IKernel.h
index 11132f2..98fd18c 100644
--- a/arm_compute/core/IKernel.h
+++ b/arm_compute/core/IKernel.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2019 Arm Limited.
+ * Copyright (c) 2016-2021 Arm Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -57,6 +57,11 @@
      * @return The maximum window the kernel can be executed on.
      */
     const Window &window() const;
+    /** Function to check if the embedded window of this kernel has been configured
+     *
+     * @return True if the windows has been configured
+     */
+    bool is_window_configured() const;
 
 protected:
     /** Configure the kernel's window