docs(linter): Add configuration docs info for import/namespace rule

[connorshea]

I can/should probably start batching these changes into larger PRs rather than opening one at a time.

Part of #14743.

Exported docs result:

## Configuration

This rule accepts a configuration object with the following properties:

### allowComputed

type: `boolean`

default: `false`

Whether to allow computed references to an imported namespace.

[graphite-app]

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[Copilot]

Pull Request Overview

This PR adds configuration documentation for the import/namespace linter rule by implementing the JsonSchema trait and documenting the allow_computed configuration option.

Key Changes:

• Added JsonSchema derive macro and serde attributes to enable configuration schema generation
• Documented the allow_computed field with a doc comment
• Registered the configuration struct in the lint rule declaration

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[camc314]

Thank yoU!

[codspeed-hq]

CodSpeed Performance Report

Merging #14799 will not alter performance

_{Comparing connorshea:import-namespace-docs (fd0c02e) with main (d185aeb)}

Summary

✅ 4 untouched
⏩ 33 skipped¹

Footnotes

1. 33 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩