Align with .NET on some of the feedback they received in this issue: Azure/azure-sdk-for-net#23088

• ListAllTranslationStatuses -> ListTranslationStatuses (async too)
• ListAllDocumentStatuses -> ListDocumentStatuses (async too)
• All refs of "cancelled", "cancelling" to one 'l' spelling like "canceled" (rename/fix poller logic)
• DocumentStatus/TranslationStatus -> DocumentStatusResult/TranslationStatusResult (maybe?? check with architects)
• FileFormat -> DocumentTranslationFileFormat