Bug Report: Typo in Method Name set_shema Should be set_schema

Description

There is a typo in the Request class where the method is named set_shema instead of the correct spelling set_schema. This affects the public API of the library.

Location: volcengine/base/Request.py:23

Current Behavior

def set_shema(self, schema):
    self.schema = schema

The method is currently called set_shema (missing 'c'), but it sets the schema attribute which is correctly spelled.

Expected Behavior

The method should be named set_schema to match:

1. The attribute name (self.schema)
2. Standard English spelling
3. Naming conventions in the rest of the codebase

Impact

The misspelled method is currently used in:

• volcengine/base/Service.py:116
• volcengine/base/Service.py:228

Suggested Fix with Backward Compatibility

To maintain backward compatibility for existing users, we should:

1. Add a new correctly-spelled method set_schema
2. Keep the old set_shema method as a deprecated alias
3. Add a deprecation warning to set_shema