[MINOR][CONNECT][PYTHON] Add missing super().__init__() in expressions

### What changes were proposed in this pull request?
Add missing `super().__init__()` in expressions

### Why are the changes needed?
to make IDEA happy:
<img width="418" alt="image" src="https://user-images.githubusercontent.com/7322292/232402659-20e7f740-7816-495f-967f-d90c3ac7eedc.png">

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
existing UT

Closes apache#40818 from zhengruifeng/connect_super.

Authored-by: Ruifeng Zheng <[email protected]>
Signed-off-by: Ruifeng Zheng <[email protected]>

python/pyspark/sql/connect/expressions.py

@@ -106,6 +106,7 @@ class CaseWhen(Expression):
     def __init__(
         self, branches: Sequence[Tuple[Expression, Expression]], else_value: Optional[Expression]
     ):
+        super().__init__()
 
         assert isinstance(branches, list)
         for branch in branches:
@@ -142,6 +143,7 @@ def __repr__(self) -> str:
 
 class ColumnAlias(Expression):
     def __init__(self, parent: Expression, alias: Sequence[str], metadata: Any):
+        super().__init__()
 
         self._alias = alias
         self._metadata = metadata
@@ -649,6 +651,7 @@ def __init__(
         deterministic: bool = False,
         arguments: Sequence[Expression] = [],
     ):
+        super().__init__()
         self._function_name = function_name
         self._deterministic = deterministic
         self._arguments = arguments