hellovai/remove default params (#1627)

- **Revert adding default params**
- **generated code fixes!**

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----

> [!IMPORTANT]
> Removed default parameter values from functions in `async_client.py`,
`sync_client.py`, `async_request.py`, and `sync_request.py` to prevent
unintended side effects from mutable defaults.
> 
>   - **Behavior**:
> - Removed default parameter values in functions across
`async_client.py`, `sync_client.py`, and `sync_request.py`.
> - Functions now require explicit parameter values, preventing
unintended side effects from mutable defaults.
>   - **Code Generation**:
> - Updated `mod.rs` to set default parameter values to `None` during
code generation.
>   - **Affected Functions**:
> - Changes in `AliasedInputList`, `BuildLinkedList`,
`DynamicListInputOutput`, `ExtractResume`,
`FnNamedArgsSingleStringOptional`, `InOutEnumMapKey`,
`InOutLiteralStringUnionMapKey`, `InOutSingleLiteralStringMapKey`,
`MapAlias`, `TestFnNamedArgsSingleEnumList`,
`TestFnNamedArgsSingleMapStringToClass`,
`TestFnNamedArgsSingleMapStringToMap`,
`TestFnNamedArgsSingleMapStringToString`,
`TestFnNamedArgsSingleStringArray`, `TestFnNamedArgsSingleStringList`,
`TestImageListInput` in `async_client.py` and `sync_client.py`.
>     - Similar changes in `async_request.py` and `sync_request.py`.
> 
> <sup>This description was created by </sup>[<img alt="Ellipsis"
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Author: hellovai

engine/language_client_codegen/src/python/mod.rs

@@ -248,11 +248,7 @@ impl TryFrom<(&'_ IntermediateRepr, &'_ crate::GeneratorArgs)> for PythonClient
                                 .inputs()
                                 .iter()
                                 .map(|(name, r#type)| {
-                                    (
-                                        name.to_string(),
-                                        r#type.to_type_ref(ir, false),
-                                        default_value_for_parameter_type(r#type),
-                                    )
+                                    (name.to_string(), r#type.to_type_ref(ir, false), None)
                                 })
                                 .collect(),
                         })