[REFACTOR] : folders arrangement for in-built methods

[pacifiquem]

For now, every in-built function is in ./src/runtime/globals.ts file.

This is not good because it's not easy to find what you want to work on or view.

Solution:

We'll add in-built folder in the runtime, each method and it's associated functions will be added to their own file, all in built methods will be imported in ./src/runtime/globals.ts where their will be added to the global environment env for use.