The current resharding implementation stores participant-specific fields in both commands and state documents, which can lead to mismatches and duplication. Introduce a refactored struct hierarchy with immutable options scoped to each participant role:

• CommonReshardingMetadata – Immutable options relevant to all participants.
• ReshardingRecipientOptions – Immutable options relevant only to recipients.
• ReshardingDonorOptions – Immutable options relevant only to donors.
• ReshardingCoordinatorOptions – Contains both ReshardingRecipientOptions and ReshardingDonorOptions (as inlined chained structs) plus additional coordinator-specific options.

Additionally, move telemetryCtx into CommonReshardingMetadata since it is applicable across all roles. See this thread for more details.