Add minimum and maximum implementation for the cognitive metric (#713)

* Add field structural_sum and refactored code to resolve issues

* Add min and max implementation for cognitive

Author: giovannitangredi

rust-code-analysis-web/src/web/server.rs

@@ -632,7 +632,7 @@ mod tests {
                        "start_line": 1,
                        "end_line": 4,
                        "metrics": {"cyclomatic": {"sum": 2.0, "average": 1.0, "min":1.0, "max":1.0},
-                                   "cognitive": {"sum": 0.0, "average": 0.0},
+                                   "cognitive": {"sum": 0.0, "average": 0.0, "min":0.0, "max":0.0},
                                    "nargs": {"total_functions": 0.0, "average_functions": 0.0, "total_closures": 0.0, "average_closures": 0.0, "total": 0.0, "average": 0.0},
                                    "nexits": {"sum": 0.0, "average": 0.0,"min":0.0,"max":0.0},
                                    "halstead": {"bugs": 0.000_942_552_557_372_941_4,
@@ -659,7 +659,7 @@ mod tests {
                                    "start_line": 3,
                                    "end_line": 4,
                                    "metrics": {"cyclomatic": {"sum": 1.0, "average": 1.0, "min":1.0, "max":1.0},
-                                               "cognitive": {"sum": 0.0, "average": 0.0},
+                                               "cognitive": {"sum": 0.0, "average": 0.0 , "min":0.0, "max":0.0},
                                                "nargs": {"total_functions": 0.0, "average_functions": 0.0, "total_closures": 0.0, "average_closures": 0.0, "total": 0.0, "average": 0.0},
                                                "nexits": {"sum": 0.0, "average": 0.0,"min":0.0,"max":0.0},
                                                "halstead": {"bugs": 0.000_942_552_557_372_941_4,
@@ -712,7 +712,7 @@ mod tests {
                        "start_line": 1,
                        "end_line": 2,
                        "metrics": {"cyclomatic": {"sum": 2.0, "average": 1.0, "min":1.0, "max":1.0},
-                                   "cognitive": {"sum": 0.0, "average": 0.0},
+                                   "cognitive": {"sum": 0.0, "average": 0.0 , "min":0.0, "max":0.0},
                                    "nargs": {"total_functions": 0.0, "average_functions": 0.0, "total_closures": 0.0, "average_closures": 0.0, "total": 0.0, "average": 0.0},
                                    "nexits": {"sum": 0.0, "average": 0.0,"min":0.0,"max":0.0},
                                    "halstead": {"bugs": 0.000_942_552_557_372_941_4,
@@ -761,7 +761,7 @@ mod tests {
                        "start_line": 1,
                        "end_line": 2,
                        "metrics": {"cyclomatic": {"sum": 2.0, "average": 1.0, "min": 1.0,"max": 1.0},
-                                   "cognitive": {"sum": 0.0, "average": 0.0},
+                                   "cognitive": {"sum": 0.0, "average": 0.0 , "min":0.0, "max":0.0},
                                    "nargs": {"total_functions": 0.0, "average_functions": 0.0, "total_closures": 0.0, "average_closures": 0.0, "total": 0.0, "average": 0.0},
                                    "nexits": {"sum": 0.0, "average": 0.0,"min":0.0,"max":0.0},
                                    "halstead": {"bugs": 0.000_942_552_557_372_941_4,
@@ -788,7 +788,7 @@ mod tests {
                                    "start_line": 1,
                                    "end_line": 2,
                                    "metrics": {"cyclomatic": {"sum": 1.0, "average": 1.0, "min": 1.0,"max": 1.0},
-                                               "cognitive": {"sum": 0.0, "average": 0.0},
+                                               "cognitive": {"sum": 0.0, "average": 0.0 , "min":0.0, "max":0.0},
                                                "nargs": {"total_functions": 0.0, "average_functions": 0.0, "total_closures": 0.0, "average_closures": 0.0, "total": 0.0, "average": 0.0},
                                                "nexits": {"sum": 0.0, "average": 0.0,"min":0.0,"max":0.0},
                                                "halstead": {"bugs": 0.000_942_552_557_372_941_4,