Add LCOW live migration source and destination APIs#2803
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Introduce an end-to-end live-migration workflow for LCOW sandboxes, letting a running sandbox be handed off from a source shim to a destination shim. - Add a migration Controller that sequences a single session through a source or destination lifecycle: the source prepares and exports an opaque sandbox snapshot (VM + per-pod state), while the destination imports it, patches each container onto its new IDs, builds the destination VM, transfers memory over a shared socket, and finalizes with a resume or stop. - Expose the migration gRPC/ttrpc surface on the LCOW shim service (PrepareAndExportSandbox, ImportSandbox, PrepareSandbox, TransferSandbox, FinalizeSandbox, Cancel, Cleanup, CreateDuplicateSocket, Notifications) and register it alongside the task and sandbox services. - Wire migration into the task lifecycle: route destination-side CreateTask for rehydrated containers into a patch path, and reject task mutations (state, delete, kill) while a session is in progress. - Add duplicated transport-socket adoption, a subscriber-based progress notification stream, and proto/HCS conversion helpers for migration options and events. Signed-off-by: Harsh Rawat <harshrawat@microsoft.com>
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Summary
Introduce an end-to-end live-migration workflow for LCOW sandboxes, letting a running sandbox be handed off from a source shim to a destination shim.
Add a migration Controller that sequences a single session through a source or destination lifecycle: the source prepares and exports an opaque sandbox snapshot (VM + per-pod state), while the destination imports it, patches each container onto its new IDs, builds the destination VM, transfers memory over a shared socket, and finalizes with a resume or stop.
Expose the migration gRPC/ttrpc surface on the LCOW shim service (PrepareAndExportSandbox, ImportSandbox, PrepareSandbox, TransferSandbox, FinalizeSandbox, Cancel, Cleanup, CreateDuplicateSocket, Notifications) and register it alongside the task and sandbox services.
Wire migration into the task lifecycle: route destination-side CreateTask for rehydrated containers into a patch path, and reject task mutations (state, delete, kill) while a session is in progress.
Add duplicated transport-socket adoption, a subscriber-based progress notification stream, and proto/HCS conversion helpers for migration options and events.
This PR needs #2790 to be merged.