feat(adwnode): Add plugin

[adrianwojdat]

Standards checklist:

• The PR title is descriptive.
• The PR doesn't replicate another PR which is already open.
• I have read the contribution guide and followed all the instructions.
• The code follows the code style guide detailed in the wiki.
• The code is mine or it's from somewhere with an MIT-compatible license.
• The code is efficient, to the best of my ability, and does not waste computer resources.
• The code is stable and I have tested it myself, to the best of my abilities.
• If the code introduces new aliases, I provide a valid use case for all plugin users down below.

Changes:

• Added NodeJs autocompleter for scripts in package.json

Other comments:

adwnode is a plugin that provides auto-completion for scripts defined in a package.json file. This plugin makes it easier to run scripts that are defined in the scripts field of a project's package.json file without having to remember the exact name of the script.

Demo