Drop timsort dependency when dropping Node 10 support

[Siilwyn]

Timsort is unmaintained and stuck at an unstable (< 1) version. It has open issues mziccard/node-timsort#8 consider:

• Using native JS sort
• Lookup alternative module
• Move sorting code to internal file

[Siilwyn]

Update, in V8 version 7.0 a fast stable sort has been implemented! Now we wait for the next LTS to implement this. ⏳

[Siilwyn]

Blocked until Node.js 10 support is dropped in April 2021.