Replace Lerna

[lmammino]

⚠️ Lerna is not supported anymore.

From the official Lerna readme:

Important note: this project https://github.com/lerna/lerna/issues/2703. Consider adopting an alternative toolset for monorepo management.

We should future-proof SLIC Watch and switch from Lerna to something else.

One of the options I was pointed at is nx and there is also a guide on how to migrate from Lerna to nx.

Another potentially interesting option is TurboRepo, recently acquired by Vercel. This one is said to work very well in combination with pnpm.