fix: clippy issue

chore: add dev container

fix: memory leakage with DeleterFn

feat: impl cache utils

fix: wrong memory alloc len of usize

feat: impl Status

feat: impl Slice

fix: add thread join

chore: format

test: finished concurrent test

feat: add concurrent test but fail compile

feat: impl ptr tower accroding to height

fix: cleanup trait bound

fix: memory free issue for Key

feat: add arena alloc