feat(nodejs): add breadcrumbs API (add, get, clear) aligned with JS catcher

[Dobrunia]

Summary

Adds a breadcrumbs API to the Node.js catcher so users can record a trail of events before an error, same idea as in @hawk.so/javascript. Only manual breadcrumbs are supported (no automatic fetch/navigation/click tracking).

[Copilot]

Pull request overview

Adds a manual breadcrumbs feature to the Node.js catcher, aligning the public API (add, get, clear) and configuration shape with @hawk.so/javascript.

Changes:

• Introduces a BreadcrumbManager singleton to store and manage breadcrumb buffers.
• Adds breadcrumbs configuration to HawkNodeJSInitialSettings and attaches breadcrumbs to outgoing event payloads.
• Updates README and example usage; bumps package version.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
types/index.ts	Extends init settings with breadcrumbs config typing; re-exports breadcrumbs options type.
src/modules/breadcrumbs.ts	New breadcrumbs module (types + singleton manager + add/get/clear).
src/index.ts	Initializes breadcrumbs, exposes HawkCatcher.breadcrumbs API, and includes breadcrumbs in payload.
package.json	Version bump to 3.2.1.
example/example.js	Updates require path to built CJS entry.
README.md	Documents breadcrumbs configuration and API usage.

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