Merge branch 'smoltcp' into 'main'

pika/Cargo.lock

pika/kernel/Cargo.toml

pika/kernel/src/common/thread/kthread.rs

pika/kernel/src/common/vfs/basics.rs

pika/kernel/src/common/vfs/devfs/mod.rs

pika/kernel/src/common/vfs/memfs/mod.rs

pika/kernel/src/common/vfs/mod.rs

pika/kernel/src/common/vfs/open_file.rs

pika/kernel/src/common/vfs/per_container.rs

pika/kernel/src/common/vfs/pipefs/mod.rs

pika/kernel/src/common/vfs/vnode.rs

pika/kernel/src/container/container_impl.rs

pika/kernel/src/container/memory/addrspace.rs

pika/kernel/src/container/memory/memregion.rs

pika/kernel/src/container/process/fd_table.rs

pika/kernel/src/container/process/proc.rs

pika/kernel/src/framework/mod.rs

pika/kernel/src/framework/network/constants.rs

.../kernel/src/framework/network/interfaces/fifo_loopback.rs

pika/kernel/src/framework/network/interfaces/mod.rs