CLI: Generic Dependency Fetchers

[dOrgJelli]

Currently in the Modular Infra Command PR, @namesty has added the concept of "Dependency Fetchers": https://github.com/polywrap/monorepo/blob/modular-testenv/packages/cli/src/lib/infra/InfraDependencyFetcher.ts

They're currently tailored to the infra pipeline, but we can make them generic and reusable for other commands like deploy & create.

Some additional dependency fetchers we can add:

• Git
• IPFS
• etc