Move processing of orderBy to runtime

[benjie]

Description

Relates to:

• Epic: removing $step.eval() #2060

Previously dynamic ordering would need to be evaluated at plantime, causing forks in the plan. This could get expensive.

This PR changes orderBy to be evaluated at runtime, allowing operation plans to be reused in more cases.

Performance impact

Small runtime cost, but helps avoid re-planning of operations.

Security impact

Helps to reduce the surface area of planning attacks.

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]

🦋 Changeset detected

Latest commit: 60dfe34

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 7 packages

Name	Type
graphile-build	Patch
graphile-build-pg	Patch
postgraphile	Patch
@dataplan/pg	Patch
graphile-utils	Patch
pgl	Patch
graphile	Patch

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