Add The Graph as a CLI option

[carletex]

We have the subgraph branch here: https://github.com/scaffold-eth/scaffold-eth-2/tree/subgraph-package

I think @technophile-04 already updated it with the latest (wagmi v2) changes, so the next step is to include the packages / deps / etc in the CLI workflow as an "extension" (we can rethink the naming)

After What solidity framework do you want to use?

We'd want to say something like: "Select which extensions you want to add". It'd be multiple select (space to select) with no selected options as the default.

A nice to have: a flag to select it by default npx create-eth@latest --extensions=subgraph.

Also thinking (for another PR maybe) that if you do -y it will auto-install everything with the default values (except the name of the project...that you could pass it as a flag/argument too!). One-liner installs with no user intervention will be key.