Added distinct query

src/cpl_query/_query/distinct_query.py

@@ -0,0 +1,24 @@
+from collections import Callable
+
+from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def distinct_query(_list: IterableABC, _func: Callable) -> IterableABC:
+    if _list is None:
+        raise ArgumentNoneException(ExceptionArgument.list)
+
+    if _func is None:
+        raise ArgumentNoneException(ExceptionArgument.func)
+
+    result = IterableABC()
+    known_values = []
+    for element in _list:
+        value = _func(element)
+        if value in known_values:
+            continue
+
+        known_values.append(value)
+        result.append(element)
+
+    return result