[translation] hook up client methods to generated code

[kristapratico]

client:

azure-sdk-for-python/sdk/documenttranslation/azure-ai-documenttranslation/azure/ai/documenttranslation/_client.py

Line 19 in 64ddb41

class DocumentTranslationClient(object):

Ensure we are calling the right generated code method, that all keyword arguments are passed in, and that we are returning the wrapped/exposed models.

[kristapratico]

closed with #17235