Separate validation of operation and coercion of variables into separate steps

[IvanGoncharov]

This draft PR shows what I'm currently working on. It passes tests but fails due to lower coverage. I will try to split it into smaller commits with proper descriptions and separate discussions. The purpose of this Draft PR is to show the end goal of these smaller comments.

Any feedback/review is welcome but please keep in mind this PR is in the exploration phase (and code is still raw) so please focus only on high-level stuff.

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[IvanGoncharov]

@github-actions publish-pr-on-npm

[github-actions[bot]]

@github-actions publish-pr-on-npm

@IvanGoncharov The latest changes of this PR are available on NPM as [email protected] 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-3658

[IvanGoncharov]

It's interesting that this change made execute faster.

I ran it a few times and it was always faster.