chore: publishing initium-cli as an NPM package

[Pehesi97]

This PR enables us to publish initium-cli as an NPM package.

For publishing the package, see the docs: https://docs.npmjs.com/cli/v8/commands/npm-publish. I've tested it with this package I published and it worked fine. See for yourself:

npx initium-cli

This PR also implements code that checks for updates when the CLI is run via npx, from the node_modules folder, or when installed globally if the user has nvm installed.

It also adds a new projectLanguage flag to initium-cli. If it's set to auto, then the existing detectType code will run and detect the project language by the existing files (package.json, go.mod, and so on). If not, the initium-cli will take the INITIUM_PROJECT_LANGUAGE or --project-language variable values as the projectLanguage.

TODO (PLEASE DON'T MERGE THIS YET!!!!): Set up an auth token in GitHub Actions' secrets, named NPM_TOKEN. I'll leave this for @LucaLanziani, once we figure out the Nearform account NPM permissions.

This PR closes #78 and closes #74 as well.

[LucaLanziani]

This looks great, I'm not sure why but I also see the "detect language" changes in this PR.

I believe that we might want to release this with optic this is something to discuss with the tech hub

[LucaLanziani]

I'm now debating if we should split this to its own repository.
If we leave it here we want to add a npmignore, right now we are publishing all the source code in the package :D

[Pehesi97]

1- My idea was to add a language flag that would default to auto. If it was auto, then the detectType function would do its job, but if not, there was no need to detect the project type. I did that because this is a go project, but when I added the package.json file, initium started treating it as a node project.
When I added the flag and the matchType function, the tests started failing. My latest commit was supposed to fix them but I need to give it some more work.

2- If I'm not mistaken, we can define what is published with the package when running npm publish. And yeah we can add a npmignore file too.

[Pehesi97]

@nearform/initium this should be ready to merge. Can anybody take a look on the PR so we can merge it?