pack chunk meta data segments into bootstrap layer #1696
Description
Nydus has extended the format of EROFS to support chunk-leveled lazy load, introducing what is called the chunk meta data segment structure. This data segment is currently placed at the end of the blob layer during build.
When nydusd mounts the image during runtime, this segment is fetched on-demand from the image registry over the network. However, the current implementation is asynchronous and lacks a robust error-retry mechanism, which can lead to issues in subsequent file system reads and prevent automatic recovery.