monofs

Implement tombstone for deletes.
Implement merging although it is a bit tricky.
- How do we handle "previous" field conflicts?
- Handling deletes with tombstones
Fix file size issue.
- We should be able to get the file size from a files metadata.
- This requires making changes to IpldStore and Layout.
- IpldStore::get_cid_size(cid: &Cid) -> Result<u64, Error>?
- Layout::get_cid_size(cid: &Cid) -> Result<u64, Error>?
checkpoint does not have to re-load the entity from the store.
- We can take an efficient shortcut by modifying the initial_load_cid in-place during store.
- Introduce an internal store_in_place method?

monoutils-store

Consider other store implementations optimized for write or read efficiency
- RocksDbStore - backed by RocksDB.
- ~~PackedFsStore - writes multiple blocks to a single file.~~
Support compression in FlatFsStore for better storage efficiency.
- Compression option for block and packed files.
- GZIP with flate2-rs.
Implement a content-defined chunker that uses Gear Hashing.
- FastCDC
- GearCDC
- Make it the default chunker for stores.
Implement BalancedDagLayout and make it the default layout for stores.
Expose IpldStore::gc and IpldStore::dereference and implement for:
- FlatFsStore
- MemoryStore
- A stored node or bytes should be deleted when the last reference is dropped.
FlatFsStore should support refcounting.
bytes and raw_blocks should support refcounting too.

Fix copy and remove permission issues on Linux.
Use sqlitedb for maintaining running services state.
Treating microvm management like a package manager.
Support multiple registries.
- Docker
- Github
- Quay
- Sandboxes
Use Reference type for image_ref where it makes sense: https://docs.rs/oci-spec/0.7.1/oci_spec/distribution/struct.Reference.html
Qualify image names fully where needed. /: