…Service ComputerVision API to V2 (#1378)

* Generated from c2567da015994dac3301f495b6c5011d28ceaffe

Add post-processing directive to swap argument order for RecognizeText to position the url argument ahead of the mode argument.

autorest does not generate the intended order, so we add a post-processing directive,
for each target language,

* Generated from 973322cfd6ec2ced60a732f53b5318ceded5de7b

Fix validation errors

* Generated from 70efe042d607cbd973734e432da395ed35191a03

Add Spanish support for ServiceLanguage

This is for parity with V1.

ComputerVision add tag.hint

Hints provided additional info for whole-image analysis tags.
This PR is to make the Swagger match the service behavior.

Enable Computer Vision Client to customize endpoint.

ComputerVision: bug fixes for /describe and /analyze

* Inconsistent argument type for `/analyze?details=...` between URL and stream methods
* BingIU imagetype return values needs to be integral
* Description `maxCandidates` argument needs to be integral