feat(attributes): Add sentry.event.serialized_meta

[mjq]

Add an internal sentry.event.serialized_meta attribute for holding Relay's metadata (PII scrubbing, etc) for the contexts, extra, and breadcrumbs in the other sentry.event.serialized_* attributes. This is currently used in the span details pane for transaction-event-based transaction/segment spans, and therefore required for backwards compatibility.

[mjq]

Related Relay PR: getsentry/relay#6296

[github-actions]

Semver Impact of This PR

🟡 Minor (new features)

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New Features ✨

Attributes

• Add sentry.event.serialized_meta by mjq in #566

• Change sentry.description scrubbing policy to manual by Lms24 in #555

Op

• Add handler op by msonnb in #554
• Add router span operation by msonnb in #551

Bug Fixes 🐛

• (ops) Add http.client.stream to http.client name and description rules by msonnb in #553

Internal Changes 🔧

Deps

• Bump dompurify from 3.4.12 to 3.4.13 by dependabot in #559
• Bump js-yaml from 4.3.0 to 4.3.1 by dependabot in #560

Other

• (docs) Add Sentry Astro SDK by Lms24 in #563
• Unstale yarn.lock by Lms24 in #561

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