os: fix lz4 error

enh: show db status such as creating and dropping

feat: cache table index

fix: invalid read/write

fix: mnode not start

fix: adjust the initial array size of fs

fix(sync) if FpEqMsg return error, do not enqueue msg

fix: error in schemaless with same timestamp

refactor: mnode worker

feat(stream): partition by

enh(query): add first/last function distributed implementation

docs: refine keywords section and add delete keywords