Support new checkpoint request protocol - #467
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This adds support for the new checkpoint request protocol. The implementation is mostly a port from the JavaScript and Kotlin PRs.
Dart-specific work in this PR is mostly related to the explicit RPC protocol used to expose custom checkpoint connectors to the sync isolate and sync worker, and the lack of a consistent 64-bit integer type across platforms.
Closes #464
AI use: Reviewed with Claude Code.