Make it possible to use local `fuels` build

[arboleya]

Currently, on all package.json we have, we export Typescript files:

"exports": {
  ".": "./src/index.ts",
  "./cli": "./src/cli.ts",
  "./runTypegen": "./src/runTypegen.ts"
}

While this enabled a seamless go to definition experience in VSCode, it prohibits using the packages locally.

Let's say I'm building an app.

• I add my local fuels as a dependency and re-run my app
• My app requires the package fuels expecting to receive Javascript
• Due to our configs (json above), it receives Typescript
• Nothing works now

Goals we're looking for:

1. Keep go to definition feature working as is
   • Developer workflow continues to be awesome
2. While exporting compiled version of the package
   • So it can be used anywhere

The solution relies (edit: may rely) on: declarationMap

[arboleya]

This has already been done in multiple follow-up PR after #827