Add KnownOperationTypes rule

[yaacovCR]

Spec PR: https://github.com/graphql/graphql-spec/pull/947 Original issue raised by @benjaminjkraft : #3592

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[github-actions[bot]]

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[yaacovCR]

@github-actions publish-pr-on-npm

[github-actions[bot]]

@github-actions publish-pr-on-npm

@yaacovCR The latest changes of this PR are available on NPM as graphql@17.0.0-alpha.1.canary.pr.3601.9a812ce71ad05c9dc089b40129f8295ca733e108 Note: no gurantees provided so please use your own discretion.

Also you can depend on latest version built from this PR: npm install --save graphql@canary-pr-3601

[benjaminjkraft]

Neat, thanks!

[benjaminjkraft]

For the sake of the record, the spec PR is now graphql/graphql-spec#955 and is scheduled for discussion on Thursday.