Use upstream instead of forks

[vmx]

Currently some forks are used. The goal is to get all the changes needed into the upstream crates. This is a tracking issue for the work that needs to done.

• cid:
  • Fork: https://github.com/dvc94ch/rust-cid/tree/cli
  • Upstream PR: Refactoring + cli multiformats/rust-cid#18
• multihash:
  • Fork: https://github.com/dvc94ch/rust-multihash/commits/cli
  • Upstream PR: Add cli interface multiformats/rust-multihash#33

I'll work on those and make it a priority. I think it's important to consolidate all existing forks into a single source of truth.

[Gozala]

I've run into the issue with #19, presumably because recent changes in https://github.com/multiformats/rust-multibase that are incompatible with uses in https://github.com/dvc94ch/rust-cid/tree/cli:

/Users/gozala/.cargo/git/checkouts/rust-cid-857ab8699b5b856b/52c079b/src/lib.rs:77:50
   |
77 |         let mut string = multibase::encode(Base::Base58btc, &self.hash.as_ref());
   |                                                  ^^^^^^^^^
   |                                                  |
   |                                                  variant or associated item not found in `multibase::base::Base`
   |                                                  help: there is a variant with a similar name: `Base58Btc`

error[E0599]: no variant or associated item named `Base58btc` found for enum `multibase::base::Base` in the current