feat: switch from snappy to snappyjs

[twoeths]

Motivation

• Lodestar already used snappyjs so there is no need to introduce another dependency with same purpose
• Lodestar only uses sync api
• There's an external memory leak issue when we upgrade to esm, switching to snappyjs help reduce the risk because snappy calls to native layer

Description

• Switch from tap to mocha
• Switch from snappy to snappyjs
• Remove asyncCompress option, only support sync api
• migrate to esm
• remove buffer-* dependencies