Dev scripts shouldn't require clang-format to be installed locally

We shouldn't assume tools are locally installed as that introduces friction, but more importantly, makes the dev env non hermetic. In general we use `go tools` (with a dedicated Go module under `hack/tools` for isolation) for tools that can be distributed with go modules, and for those that can't (like clang-format), we have as script that fetches a pinned version (see protoc as an example[1]).

[1]: https://github.com/agent-substrate/substrate/blob/381b3ad52ca7dbf04e453872a3acfe2d6bd4cbd0/hack/protoc.sh#L21