[Release 4.0.0]: Breaking change - Remove circular dependencies from index.ts

This release introduces a breaking change. Circular dependencies were discovered and removed from index.ts, this unfortunately meant that imported project modules were removed from the file, hence causing the breaking change. Additionally there were some NFRs to help keep the project standardised from a quality/format/style perspective.

Changes include:

• e4e5ef4 - issue-36: Add Husky for managing pre-commit/push commands
• 6d9a52a - issue-35: Add ESLint to standardise project
• 252be6c - issue-33: Introduce Prettier and format the whole project
• bb4bbd7 - issue-31: Add NPM prepare script
• f4f20ba - issue-29: Remove circular dependencies in index.ts