feat(playground): central ai provider config (#6248)

* add graphql support for the api key and whether or not it's set.

* chagne the name

* Add icons, table

* cleanup

* add modal

* type ignore

* Update app/src/pages/playground/PlaygroundCredentialsDropdown.tsx

Co-authored-by: Anthony Powell <apowell@arize.com>

* Update app/src/pages/settings/GenerativeProvidersCard.tsx

Co-authored-by: Anthony Powell <apowell@arize.com>

* push icons

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Co-authored-by: Anthony Powell <apowell@arize.com>