Mark all eval methods as internal

[benjie]

Description

Long term aim is to completely remove eval. For now, we'll settle for just using it for @skip, @include, @defer and @stream if: evaluation

Performance impact

None.

Security impact

Helps guide people away from using $input.eval*(), which avoids plan branching, helping to avoid DOS through plan explosion.

Checklist

• My code matches the project's code style and yarn lint:fix passes.
• I've added tests for the new feature, and yarn test passes.
• I have detailed the new feature in the relevant documentation.
• I have added this feature to 'Pending' in the RELEASE_NOTES.md file (if one exists).
• If this is a breaking change I've explained why.

[changeset-bot]

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Latest commit: d06e474

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