chore: Set up npm publish automation #18
Description
Once we have release-please version bumping in place, we should also add the ability to automatically build and publish the 3 SDK variants:
@namada/sdk@namada/sdk-multicore@namada/sdk-node
Our process should also bump packages/lib/src/version.ts prior to this.
When we issue a final release, we should ensure that the type docs are rebuilt if anything in crate or lib has changed.