Publish a temporary @zetachain/protocol-contracts@athens3 package

[fadeev]

@andresaiello as there are multiple packages depending on @zetachain/protocol-contracts being ready for Athens 3, I propose the following.

Let's publish this package under an athens3 tag on npm.

This could be as simple as adding the following workflow:

https://github.com/zeta-chain/networks/blob/8613fa8406a5a739dc3318a0f98306a6b408d05d/.github/workflows/publish-npm.yaml

After this workflow is added, to publish under an athens3 tag:

1. Create a new release
2. Select "Create a new tag on publish" and type v1.0.0-athens3 (note the v)
3. Click "Publish release"

Users can install this package with yarn add @zetachain/protocol-contracts@athens3.

To release a new athens3 version repeat the process above with an incremented minor or patch version, for example, v1.0.1-athens3.

To release a new stable version repeat the process above using a version without a tag, for example, v1.0.0.

Users can install this package with yarn add @zetachain/protocol-contracts.

I propose we release under athen3 as often as possible, so that other tasks can be unblocked. Right now I have to rely on a locally linked protocol-contracts package, which is much less convenient than a tagged version on npm.

[fadeev]

Related to this, we also need to publish typechain-types and abi of contracts.