Deprecated logger package currently only used by legacy API.

This is a simplified version of the core API shared logger package.

After making changes, please follow these steps so that legacy API will pick up the changes:

• Ensure that yarn build was run so that dist/logger.js is updated
• Update the version: npm version minor or npm version patch
• Push up changes to the master branch
  • git push origin master
  • git push --tags (note the new tag version)
• Update the tag version for @coast/logger in legacy API package.json