* feat: add zstddec worker

* fix buffer.slice

* fix: indentation

* fix: indentation

* fix: indentation

* fix: indentation

* feat: update basis_transcoder & KTX2Loader & WorkPool locate worker on demand & add sample_uastc_zstd.ktx2

* remove zstddec & zstddec.worker

* misc: code format

* fix: typo queue