Repository Refactoring (proposal)

In order to avoid making a huge PR with generic changes, I'm going to write a tracking issue here that lists the changes I would like to propose, in that way we will have a sort of changes tracking to isolate changes by 'type'.

This issue supersedes #80, which involved a series of structural changes too delicate to be made all at once.

• #81 - This pr is used to add typescript as a dependency, use it to generate types and add type references inside files
• #85 - Move files from lib to src (including index.js)
• #84 - Remove deprecations (slice, substr)
• #90 - removes deprecations
• #87 - Remove the safe-buffer library, it's a fallback for node <5.0, but since we are requiring node >16 it's pretty useless
• #88 - Speed up parser replacing regex with string comparison when possible
• #89 - Enhances the jsDocs
• #96 - Coverage report
• #97 #98 - Full tests coverage
• #83 - Update changelog, version and readme (require should be replaced with import)

This is a tracking issue for repository refactoring, with completed work covering lib, src, index.js, TypeScript references, deprecations, parser performance, and JsDocs. Start by reading the remaining linked issues #97, #98, and #83, since this issue does not define their implementation details. Done means those checklist items are resolved and the tracking list reflects their status.