New Api-Version onboarding 2021-12-01-preview (Azure#18478)

* Adding 2021-12-01-preview as a copy of 2021-08-01

* Readme update

* Updating version in the 2021-12-01-preview folder

* update description for keyvault contract (Azure#17150)

Co-authored-by: Kacie Kang <[email protected]>

* fix for the last cherry pick (06d2de8)

* fixing readme again

* APIM Policy fragments (Azure#16403)

* Adding the policy fragments spec

* Formatting

* Updating descriptions

* PolicyFragmentIdParameter as a string

* ID validation

* Adding fragment description

* Adding policy fragment format

* Adding raw xml format

* Addinga 202 response for creating/updating

* Generalising the resource collection

* formatting

* Moving everything to 2021-12-01

* version fix

* Adding pagination params. Generalising the IdParam

* Adding missing fields, fixing id param name

* Removing link formats. Fixing format param name

* POST list references

* name filter now supports "contains"

* PUT is always async

* Fixing header location url

* PUT can now return 200 and 201

* Adding more OData query support. Fixing examples.

* Resolving the cross breaking change

Co-authored-by: Milan Zolota <[email protected]>

* Added CORS and CSP configuration resources (Azure#16822)

* Added CORS and CSP settings resources.

* Added missing definitions.

* Added suppression of R4009 for apimportalsettings.json.

* Ran Prettier.

* Renamed definitions.

* Fixed references.

* Updated examples.

* Reversed change.

* Created new resource for portal settings.

* Added list example.

* Added missing collection contract.

* Added missing example. Cleaned up old ones.

* Fixed references.

* Fixed examples

* Fixed version.

* Added custom words. Fixed linting.

* Fixes.

* Fixes.

* Fixes.

* Fixes.

* Fixes.

* Fixes.

* Fixes.

* Fixes.

* Fixes.

* Fixes.

* Fixes

* Fixes.

* Fixes.

* Fixes

* Fixes

* Removed conflicting constraint.

* Updated readme.go.md.

* Reverted removing the restriction.

* Revert "Reverted removing the restriction."

This reverts commit 72d070f6ccc8231e4d4c9f22ac3a9c3090a545aa.

* Removed duplicate.

* Addressing PR comments.

* Adjusted reportUri property type in CSP config contract. (Azure#17947)

* Added missing body parameter description for content type resource. (Azure#18036)

* Igo/msal client version (Azure#17866)

* Added clientLibrary property to IdentityProvider

* fixed length for clientLibrary property

* Model validation fixes

* moved changes for clientLibrary property to the right spec file

* Update readme.md

Co-authored-by: Milan Zolota <[email protected]>
Co-authored-by: Kacie <[email protected]>
Co-authored-by: Kacie Kang <[email protected]>
Co-authored-by: Alexander Zaslonov <[email protected]>
Co-authored-by: Igor O <[email protected]>
Co-authored-by: Yuchao Yan <[email protected]>