Add docs for a the operation timings

[AlenaSviridenko]

Description

This is documentation that addresses changes I'm making in wundergraph/cosmo#2491. It explains what operation timing is, and how to use in a customer module.

Summary by CodeRabbit

• Documentation
  • Added guidance on accessing operation timings within Middleware, detailing available timing fields (ParsingTime, ValidationTime, NormalizationTime, PlanningTime) and timing accuracy considerations.

Checklist

• I have validated my changes locally using mintlify dev
• I have validated my changes are working as expected by looking at the preview deployment
• All links in my documentation work correctly
• All images render properly
• Code examples are tested and formatted correctly
• If I added new pages, they are included in the navigation (docs.json)

[coderabbitai]

Walkthrough

Adds a new documentation section to the custom modules guide explaining how to access operation timing information from the request context within Middleware. The section includes a code example, documentation of OperationTimings fields (ParsingTime, ValidationTime, NormalizationTime, PlanningTime), and a note regarding timing accuracy. The section appears in two locations within the document.

Changes

Cohort / File(s)	Summary
Documentation docs/router/custom-modules.mdx	Added new "Access operation timings" section with Middleware code example, OperationTimings field descriptions, and timing accuracy note (29 lines added). Section appears duplicated in two document locations.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Add docs for a the operation timings' is related to the changeset, which adds documentation about operation timings. However, it contains a grammatical error ('for a the' should be 'for the') and is somewhat generic.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[StarpTech]

LGTM, thank you!