feat(fetch): expose Body size

[medz]

Summary

• Add Body.size as a public int? byte-length property.
• Preserve known sizes for Block-backed bodies and encoded FormData bodies without consuming them.
• Return null for arbitrary stream-backed bodies where the length is not known synchronously.

Validation

• dart format --output=none --set-exit-if-changed .
• dart analyze
• dart test -p vm -p node -p chrome

No linked issue.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 44d153a5-4fe7-40b5-8082-0ea390ea564e

📥 Commits

Reviewing files that changed from the base of the PR and between 660f5ab and e918188.

📒 Files selected for processing (4)

• CHANGELOG.md
• lib/src/fetch/body.dart
• test/body_test.dart
• test/public_api_surface_test.dart

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/body-size

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