feat: when using from table to time series feature must be given (#572)

Closes #571 

### Summary of Changes

TimeSeries no longer is subclass of TaggedTable only of Table
<!-- Please provide a summary of changes in this pull request, ensuring
all changes are explained. -->

---------

Co-authored-by: megalinter-bot <[email protected]>

Author: Gerhardsa0

src/safeds/data/tabular/containers/_table.py

@@ -1,8 +1,8 @@
 from __future__ import annotations
 
-import sys
 import functools
 import io
+import sys
 import warnings
 from pathlib import Path
 from typing import TYPE_CHECKING, Any, TypeVar
@@ -1774,7 +1774,7 @@ def time_columns(self, target_name: str, time_name: str, feature_names: list[str
         """
         from ._time_series import TimeSeries
 
-        return TimeSeries._from_table_to_time_series(self, target_name, time_name, feature_names)
+        return TimeSeries._from_table(self, target_name, time_name, feature_names)
 
     def transform_column(self, name: str, transformer: Callable[[Row], Any]) -> Table:
         """

src/safeds/data/tabular/containers/_time_series.py

@@ -53,7 +53,8 @@ def assert_that_time_series_are_equal(table1: TimeSeries, table2: TimeSeries) ->
         The timeseries to compare the first timeseries to.
     """
     assert table1.schema == table2.schema
-    assert table1.features == table2.features
-    assert table1.target == table2.target
+    assert table1._feature_names == table2._feature_names
+    assert table1.features == table2._features
+    assert table1.target == table2._target
     assert table1.time == table2.time
     assert table1 == table2