[codex] Add rrweb-snapshot utility boundaries

[Juice10]

Summary

• add snapshot-domain and rebuild-domain utility entrypoints in rrweb-snapshot
• route snapshot and rebuild internals through those entrypoints without changing imported symbols
• keep the legacy utils export public and document the compatibility path

Validation

• yarn workspace rrweb-snapshot check-types
• yarn workspace @rrweb/record build
• yarn workspace @rrweb/record test
• rg -n "postcss" packages/record/dist --glob '*.{js,cjs}' (no matches)\n\nSupersedes fork PR [codex] Add rrweb-snapshot utility boundaries Juice10/rrweb#19.

[changeset-bot]

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Latest commit: b46b6c9

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[github-actions]

Bundle Size Changes

No bundle size changes.

[eoghanmurray]

Approving on the assumption that this is a good thing to have already present in the 2.0 release, but otherwise we should skip the noise and implement #1839 instead

The base branch was changed.