Add basic devcontainer

Merge branch 'flowchartsman-unsafe_to_bits'

replace custom log2 impl with bits.Len64

demonstrate that bits.Len64 passes tests

Tweak README.md wording

doc: explain differences between puddle and Go sync.Pool

Release v2.2.2

fix: stop importing nanotime from runtime via linkname

chore(pool): better assertions in stats test

chore(pool): added test for EmptyAcquireWaitTime

feat(pool): Add EmptyAcquireWaitTime stats

Update godoc link to v2

Fix documentation of NewPool

Release v2.2.1

CreateResource cannot overflow pool