feat: added test_repr table tests (#410)

Closes #349 

### Summary of Changes

Added a test_repr.py file to
`tests/safeds/data/tabular/containers/_table` that tests the fuction
__repr__ of class Table

tests/safeds/data/tabular/containers/_table/test_repr.py

@@ -0,0 +1,19 @@
+import pytest
+from safeds.data.tabular.containers import Table
+
+
+@pytest.mark.parametrize(
+    ("table", "expected"),
+    [
+        (Table(), "Empty DataFrame\nColumns: []\nIndex: []"),
+        (Table({"col1": [0]}), "   col1\n0     0"),
+        (Table({"col1": [0, "1"], "col2": ["a", "b"]}), "  col1 col2\n0    0    a\n1    1    b"),
+    ],
+    ids=[
+        "empty table",
+        "table with one row",
+        "table with multiple rows",
+    ],
+)
+def test_should_return_a_string_representation(table: Table, expected: str) -> None:
+    assert repr(table) == expected