Azure Text Analytics client library samples for JavaScript

[ai-text-analytics] Samples overhaul (#7052)

* [ai-text-analytics] typescript samples

* JS versions of TS samples

* samples metadata for js

* fixup samples/tsconfig.json

* Fix samples/tsconfig.json .. Need DOM to compile samples

* Removed 'export' from JS samples

* dotenv

* npm scripts

* Removed "Cognitive Services" from the samples titles to reduce length

* some fixups

* Some more fixes