FPBounds is identical to the definition in `pkg/storage/bloom/v1/bounds.FingerprintBounds` which ensures we can cast between them without allocations.

TODO: Define BlockRef and SingleTenantTSDBIdentifier as messages so we can use them right away instead of unmarshaling them from strings or doing unsafe casts.

UnimplementedPlannerForBuilderServer can be embedded to have forward compatible implementations.

PlannerForBuilderClient is the client API for PlannerForBuilder service.

PlannerForBuilderServer is the server API for PlannerForBuilder service.