Refactor and split `utilities.ts`

[whoabuddy]

This file has grown quite large and while everything is separated by clear comment sections, it's big enough we can split out each section into its own file.

Will affect a lot of imports/exports though so changes need to be made with care.

[biwasxyz]

This repository has been superseded by aibtc-mcp-server and skills. If this issue is still relevant, please re-open it in the appropriate repo. This repo will be archived soon.