1. summarizer api

2. summarizer api: `availability()` static method

3. summarizer api: `create()` static method

4. summarizer api: `destroy()` instance method

5. summarizer api: `expectedcontextlanguages` property

6. summarizer api: `expectedinputlanguages` property

7. summarizer api: `format` property

8. summarizer api: `inputquota` property

9. summarizer api: `length` property

10. summarizer api: `measureinputusage()` instance method

11. summarizer api: `outputlanguage` property

12. summarizer api: `sharedcontext` property

13. summarizer api: `summarize()` instance method

14. summarizer api: `summarizestreaming()` instance method

15. summarizer api: `type` property