feat: provide 'Execute Query' for /* GraphQL */ templates

[AumyF]

It partially fixes #232. (Completions still don't work; we may need to fix graphql-language-service-server.)

[acao]

@AumyF awesome! yes correct, I can show you where that lives in the language server, findGraphQLTags.

[acao]

https://github.com/graphql/graphiql/blob/fe5bb0dca326ee307bb6a618536819c0b505f7c9/packages/graphql-language-service-server/src/findGraphQLTags.ts#L71 here is where we specify the template tags - i.e. gql`` , graphql``, gql(), and graphql().

in order to pick up on a comment such as this one or #graphql comment declaration, we will need to add new babel parser visitors

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🦋 Changeset detected

Latest commit: c68375a21de3968bd057210a161d4c695602f66c

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[acao]

I'm terribly sorry @AumyF , when rebasing your commit to handle upstream conflicts and add changeset I somehow broke the authorship by accident, and now the CLA bot isn't happy ://. i tried doing `git commit --amend --author="Aumy "