Publish a bundled version again

[dmytro-grankin]

Since recently, an NPM artifact doesn't provide a bundled version anymore.

It was done since parsing of Protobuf messages wasn't working in the bundled version. The reason is that the import of TypeParsers always references a file from the unbundled version:

// The import generated by Spine's Protobuf Plugin for JS.
let TypeParsers = require('spine-web/client/parser/type-parsers.js').default;

Instead, in pb.js files used in the bundled version should be import TypeParsers from the bundled version too:

// Import `TypeParsers ` from a bundle.
let TypeParsers = require('spine-web/bundle').default;

There is no easy way to adjust these imports depending on the used version (bundled/unbundled). Commonly, the end user can bundle sources on its own, so the absence of the bundled version is not crucial.

After the root issue will be resolved, we should enabled the bundle publishing again, by reverting these changes.