Create rule S6886 (#3572)

* Create rule S6886

* Specify rule

* CR fixes

* CR fixes

* Modify rule classification and impacts

* Invert two words

---------

Co-authored-by: maksim-grebeniuk-sonarsource <[email protected]>
Co-authored-by: Maksim Grebeniuk <[email protected]>
Co-authored-by: Ghislain Piot <[email protected]>

rules/S6886/metadata.json

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+{
+}

rules/S6886/python/metadata.json

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+{
+  "title": "offset-naive datetime.time and datetime.datetime objects should not be compared with offset-aware ones",
+  "type": "BUG",
+  "status": "ready",
+  "remediation": {
+    "func": "Constant\/Issue",
+    "constantCost": "5min"
+  },
+  "tags": [
+  ],
+  "defaultSeverity": "Major",
+  "ruleSpecification": "RSPEC-6886",
+  "sqKey": "S6886",
+  "scope": "All",
+  "defaultQualityProfiles": ["Sonar way"],
+  "quickfix": "unknown",
+  "code": {
+    "impacts": {
+      "RELIABILITY": "HIGH"
+    },
+    "attribute": "LOGICAL"
+  }
+}

rules/S6886/python/rule.adoc

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+This rule raises an issue when trying to perform comparison or arithmetic operations between `offset-naive` and `offset-aware` Datetimes.
+
+== Why is this an issue?
+
+`datetime.datetime` and `datetime.time` objects may be categorized as "aware" or "naive" depending on whether or not they include timezone information.
+
+Comparison or arithmetic operations between `offset-naive` and `offset-aware` datetimes raise a `TypeError`.
+
+== How to fix it
+Perform comparison or arithmetic operations only between offset-naive or only between offset-aware Datetimes.
+
+=== Code examples
+
+==== Noncompliant code example
+
+[source,python,diff-id=1,diff-type=noncompliant]
+----
+import datetime
+from pytz import timezone
+
+tz = timezone('America/New_York')
+dt1 = datetime.datetime(2023, 5, 23, tzinfo=tz)
+dt2 = datetime.datetime(2023, 5, 24)
+
+if dt1 < dt2: # Noncompliant: TypeError: can't compare offset-naive and offset-aware datetimes
+    ...
+----
+
+==== Compliant solution
+
+[source,python,diff-id=1,diff-type=compliant]
+----
+import datetime
+from pytz import timezone
+
+tz = timezone('America/New_York')
+dt1 = datetime.datetime(2023, 5, 23, tzinfo=tz)
+dt2 = datetime.datetime(2023, 5, 24, timezone.utc)
+
+if dt1 < dt2: # OK
+    ...
+----
+
+== Resources
+=== Documentation
+* Python documentation - https://docs.python.org/3/library/datetime.html#aware-and-naive-objects[Aware and Naive Objects]