RATIS-2310. Implement hashCode and equals method for SizeInBytes class. (#1272)

Author: nandakumar131

ratis-common/src/main/java/org/apache/ratis/util/SizeInBytes.java

@@ -83,4 +83,14 @@ public String getInput() {
   public String toString() {
     return description;
   }
+
+  @Override
+  public boolean equals(Object obj) {
+    return obj instanceof SizeInBytes && size == ((SizeInBytes)obj).size;
+  }
+
+  @Override
+  public int hashCode() {
+    return Long.hashCode(size);
+  }
 }