Combine npm scripts into rollup multiconfig

[TrySound]

In this diff I combined rollup configs to reduce node and rollup load time. It is saved half of build time (7-8s to 3.5s for me).

Added size snapshot plugin to track the size across any commit. This increased a bit build time to ~5s. So we still win here.

Removed replace plugin which does not affect existing code.

Reused main field from package.json in rollup config.

[sanniassin]

Thanks! I suppose we can also remove rollup-plugin-node-resolve.

[TrySound]

Good catch!

[TrySound]

Done