Add KnownOperationTypes rule

[yaacovCR]

New Spec PR: graphql/graphql-spec#1098
Old Spec PR: graphql/graphql-spec#947
Original issue raised by @benjaminjkraft : #3592

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@yaacovCR The latest changes of this PR are available on NPM as
graphql@17.0.0-alpha.1.canary.pr.3601.9a812ce71ad05c9dc089b40129f8295ca733e108
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Also you can depend on latest version built from this PR:
npm install --save graphql@canary-pr-3601

[benjaminjkraft]

Neat, thanks!

[IvanGoncharov]

Looks good now 👍
So let's wait for stage2 to merge it.
Personally, I'm for fast-forwarding it to stage2 the next wg.

[benjaminjkraft]

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

[benjie]

We're back to (an updated):

• Add validation rule that operation types exist graphql-spec#955

I'm happy to continue to champion this at the WG unless someone else would like to take it on.