Remove filter in rule public_model_has_example_sql (#80)

A rule should not care about public/private models, for this a
RuleFilter should be used.

Author: matthieucan

docs/programmatic_invocations.md

@@ -32,7 +32,7 @@ $ dbt-score lint --format json
           "severity": "medium",
           "message": "Model lacks an owner."
         },
-        "dbt_score.rules.generic.public_model_has_example_sql": {
+        "dbt_score.rules.generic.has_example_sql": {
           "result": "OK",
           "severity": "low",
           "message": null

src/dbt_score/rules/generic.py

@@ -44,9 +44,9 @@ def sql_has_reasonable_number_of_lines(
 
 
 @rule(severity=Severity.LOW)
-def public_model_has_example_sql(model: Model) -> RuleViolation | None:
-    """The documentation of a public model should have an example query."""
-    if model.language == "sql" and model.access == "public":
+def has_example_sql(model: Model) -> RuleViolation | None:
+    """The documentation of a model should have an example query."""
+    if model.language == "sql":
         if "```sql" not in model.description:
             return RuleViolation(
                 "The model description does not include an example SQL query."