Bootstrap the library at version 2.0.0-snapshot.X.

[armiol]

This changeset brings the Validation library for TypeScript in version 1.0.0-snapshot.2.

The package is already published to NPM and available at https://www.npmjs.com/package/@spine-event-engine/validation-ts.

In the scope of this PR, the following changes have been made:

• Added the support of all modern Spine Validation options.
• Documentation and unit tests were created.
• A small smoke-test application was added.
• GitHub Actions was configured with two workflows:
  • Built and run tests upon every push.
  • Publish to NPM registry upon pushing to master from GH Actions as a Trusted Publisher for this package.

Additionally, these changes were made to our account at NPM:

1. spine-event-engine was converted to an NPM organization.
2. The first version of the newly created package was manually published — as it is the precondition for automated publishing via GH Actions.