AS-81: Move project under Speechify's name, setup CI/CD

[GedasGa]

Description

This project was recently moved from the https://github.com/Saghen account. This PR updates package.json and other related places, renames the owner of the repo, and points to @speechify's GitHub packages registry.

Also sets up an automated CI/CD pipeline for testing and deployment.

[linear]

AS-81 Fix SSML validation

The following request returns "Invalid SSML"

{
  "audioFormat": "ogg",
  "ssml": " <speak>both P<0.001). The rates of sPGA scores of 0 or 1 at week 12 were also significantly higher with brodalumab 210mg than placebo (79% vs 4% [AMAGINE-2] and 80% vs 4% [AMAGINE-3]; both P<0.001).</speak>", 
  "voiceParams": {
    "name": "A",
    "engine": "google",
    "languageCode":"en-GB"
  }
}

However, the SSML looks valid. At the first glance, it seems that < cause the validation to fail.

[Saghen]

A few small things:

• Can we use .yaml for the workflows for consistency with our manifests in other projects
• Publish to @saghen/string-tracker on NPM as well. I've added a token for writing packages as NPM_TOKEN