feat: expose event sanitizers in Node.js [4/6]

[willkill07]

Overview

Exposes the mark and scope event sanitizer registries from PRs #371 and #372 through the Node.js binding and plugin context.

• I confirm this contribution is my own work, or I have the right to submit it under this project's license.
• I searched existing issues and open pull requests, and this does not duplicate existing work.

Details

• Adds runtime and scope-local N-API registrations.
• Extends JavaScript PluginContext and TypeScript EventSanitizeFields declarations.
• Adds mark to PII configuration typing and defaults.
• Uses the direct/thread-safe callback paths required by synchronous and async runtimes.
• Tests conversion, ordering, field removal, invalid callbacks, scope cleanup, plugin cleanup, and PII configuration.
• Contains no documentation changes; documentation is isolated in a final independent PR.
• Breaking changes: none.

Validation: just test-node (251 tests), focused event sanitizer tests, 100% JavaScript wrapper coverage, formatting, docstring checks, Clippy, and pre-commit.

Where should the reviewer start?

Start with crates/node/src/api/mod.rs, crates/node/src/callable.rs, and crates/node/tests/event_sanitizers_tests.mjs.

Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)

• Relates to: RELAY-409

[github-actions]

Fern docs preview: https://nvidia-preview-pull-request-374.docs.buildwithfern.com/nemo/relay (​https://nvidia-preview-pull-request-374.docs.buildwithfern.com/nemo/relay​)

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