Create rule S7415: Immutable variables should not be used in while loop conditions (#4754)

* Create rule S7415

* Update RSPEC

---------

Co-authored-by: yassin-kammoun-sonarsource <yassin-kammoun-sonarsource@users.noreply.github.com>
Co-authored-by: yassin-kammoun-sonarsource <yassin.kammoun@sonarsource.com>

rules/S7415/metadata.json

@@ -0,0 +1,2 @@
+{
+}

rules/S7415/rust/metadata.json

@@ -0,0 +1,24 @@
+{
+  "title": "Immutable variables should not be used in while loop conditions",
+  "type": "BUG",
+  "status": "ready",
+  "remediation": {
+    "func": "Constant\/Issue",
+    "constantCost": "5min"
+  },
+  "tags": [
+    "clippy"
+  ],
+  "defaultSeverity": "Major",
+  "ruleSpecification": "RSPEC-7415",
+  "sqKey": "S7415",
+  "scope": "All",
+  "defaultQualityProfiles": ["Sonar way"],
+  "quickfix": "unknown",
+  "code": {
+    "impacts": {
+      "RELIABILITY": "HIGH"
+    },
+    "attribute": "LOGICAL"
+  }
+}

rules/S7415/rust/rule.adoc

@@ -0,0 +1,31 @@
+== Why is this an issue?
+
+Having an immutable condition in a while loop can result in an infinite loop as the condition will never change, causing the loop to run indefinitely.
+
+=== Code examples
+
+==== Noncompliant code example
+
+[source,rust,diff-id=1,diff-type=noncompliant]
+----
+let i = 0;
+while i > 10 { 
+    println!("let me loop forever!"); // Noncompliant: 'i' does not change within the loop body
+}
+----
+
+==== Compliant solution
+
+[source,rust,diff-id=1,diff-type=compliant]
+----
+let mut i = 0;
+while i <= 10 { 
+    println!("looping: {}", i); // Compliant: 'i' gets incremented within the loop body
+    i += 1;
+}
+----
+
+== Resources
+=== Documentation
+
+* Clippy Lints - https://rust-lang.github.io/rust-clippy/master/index.html#while_immutable_condition