feat: rename count_row_if to count_rows_if (#960)

### Summary of Changes

Rename `Table.count_row_if` to `Table.count_rows_if` (plural). 

For all other methods of `Table`, the plural form was used, but if users
typed "rows", this method was not suggested by auto-completion. The
`_if` suffix is still included, to distinguish the method from the
attribute `row_count`.

---------

Co-authored-by: megalinter-bot <129584137+megalinter-bot@users.noreply.github.com>

Author: lars-reimann

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

@@ -1007,22 +1007,22 @@ def transform_column(
     # ------------------------------------------------------------------------------------------------------------------
 
     @overload
-    def count_row_if(
+    def count_rows_if(
         self,
         predicate: Callable[[Row], Cell[bool | None]],
         *,
         ignore_unknown: Literal[True] = ...,
     ) -> int: ...
 
     @overload
-    def count_row_if(
+    def count_rows_if(
         self,
         predicate: Callable[[Row], Cell[bool | None]],
         *,
         ignore_unknown: bool,
     ) -> int | None: ...
 
-    def count_row_if(
+    def count_rows_if(
         self,
         predicate: Callable[[Row], Cell[bool | None]],
         *,
@@ -1059,10 +1059,10 @@ def count_row_if(
         --------
         >>> from safeds.data.tabular.containers import Table
         >>> table = Table({"col1": [1, 2, 3], "col2": [1, 3, 3]})
-        >>> table.count_row_if(lambda row: row["col1"] == row["col2"])
+        >>> table.count_rows_if(lambda row: row["col1"] == row["col2"])
         2
 
-        >>> table.count_row_if(lambda row: row["col1"] > row["col2"])
+        >>> table.count_rows_if(lambda row: row["col1"] > row["col2"])
         0
         """
         expression = predicate(_LazyVectorizedRow(self))._polars_expression

tests/safeds/data/tabular/containers/_table/test_count_row_if.py renamed to tests/safeds/data/tabular/containers/_table/test_count_rows_if.py

@@ -1,4 +1,5 @@
 import pytest
+
 from safeds.data.tabular.containers import Table
 
 
@@ -30,7 +31,7 @@ def test_should_handle_boolean_logic(
     expected: int,
 ) -> None:
     table = Table({"a": values})
-    assert table.count_row_if(lambda row: row["a"] < 2) == expected
+    assert table.count_rows_if(lambda row: row["a"] < 2) == expected
 
 
 @pytest.mark.parametrize(
@@ -61,4 +62,4 @@ def test_should_handle_kleene_logic(
     expected: int | None,
 ) -> None:
     table = Table({"a": values})
-    assert table.count_row_if(lambda row: row["a"] < 2, ignore_unknown=False) == expected
+    assert table.count_rows_if(lambda row: row["a"] < 2, ignore_unknown=False) == expected