Create rule S4962: "std::ptr::null" should be used to denote the null pointer (#4697)

* Add rust to rule S4962

* Remove tag

---------

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

rules/S4962/metadata.json

@@ -1,2 +1,3 @@
 {
+
 }

rules/S4962/rust/metadata.json

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+{
+  "title": "\"std::ptr::null\" should be used to denote the null pointer",
+  "type": "CODE_SMELL",
+  "code": {
+    "impacts": {
+      "MAINTAINABILITY": "HIGH"
+    },
+    "attribute": "CONVENTIONAL"
+  },
+  "status": "ready",
+  "remediation": {
+    "func": "Constant\/Issue",
+    "constantCost": "1min"
+  },
+  "tags": [
+    "clippy"
+  ],
+  "extra": {
+    "replacementRules": [
+
+    ],
+    "legacyKeys": [
+
+    ]
+  },
+  "defaultSeverity": "Critical",
+  "ruleSpecification": "RSPEC-4962",
+  "sqKey": "S4962",
+  "scope": "All",
+  "defaultQualityProfiles": [
+    "Sonar way"
+  ],
+  "quickfix": "unknown"
+}

rules/S4962/rust/rule.adoc

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+== Why is this an issue?
+
+Using ``++0 as *const T++`` or ``++0 as *mut T++`` to represent a null pointer is error-prone and less readable. It can lead to confusion and potential bugs, as it is not immediately clear that `0` is intended to represent a null pointer. Additionally, using ``++0++`` for null pointers is not idiomatic Rust, and it can make the code harder to understand and maintain.
+
+== How to fix it
+
+Use ``++std::ptr::null++`` or ``++std::ptr::null_mut++`` to represent null pointers. These functions are explicitly designed for this purpose and make the intent of the code clear.
+
+=== Code examples
+
+==== Noncompliant code example
+
+[source,rust,diff-id=1,diff-type=noncompliant]
+----
+let ptr = 0 as *const i32;
+let mut_ptr = 0 as *mut i32;
+----
+
+==== Compliant solution
+
+[source,rust,diff-id=1,diff-type=compliant]
+----
+let ptr = std::ptr::null::<i32>();
+let mut_ptr = std::ptr::null_mut::<i32>();
+----
+
+== Resources
+=== Documentation
+
+* Clippy Lints - https://rust-lang.github.io/rust-clippy/master/index.html#zero_ptr