add exslices.Slice function

use github.com/stretchr/testify/assert instead of depreated github.co…

…m/ImSingee/tt

add eco

add allow_linkname tag to enable legacy functions

remove legacy functions (which use go:linkname) in go1.23

exbinary: add EncodeBigEndian, DecodeBigEndian, EncodeLittleEndian, D…

…ecodeLittleEndian

add exbinary

exnet: add Listen

update README

exlist: mark ToSet as deprecated