Codebase refactoring

[nodkz]

@vasturiano it will be nice if you permit me to refactor your codebase:

• add typescript as a main language
• add eslint & prettier
• rename & split files (one class per file)
• setup gitlab actions for automatic tests
• add semantic-release for automation package publishing when changes landed to master branch

[vasturiano]

@nodkz thanks. You can always submit a PR if you find that a particular change/refactor is useful to the broader consumers of the lib. That's highly appreciated.

Also keep in mind that the library already offers TypeScript definitions.

[nodkz]

Yep, it has. But better to have real code written in ts which ridiculously simplifies library support by static analysis (autocompletion, type check, safer & faster refactoring).