Sample statistics and notifications server

[mgaffigan]

Closes #24 and #25. Alternative to #79. Connect Service is a sample implementation of a web service which records usage
of Mirth Server in ElasticSearch to allow Kibana Dashboards, and provides access to a notifications feed. The service implements
the operations called by the client in ConnectServiceUtil.java.

Testing may be accomplished by:

1. Set URL_CONNECT_SERVER in ConnectServiceUtil.java to "http://localhost:3000"
2. Update REPO_URL in connectservice/github.js to 'https://api.github.com/repos/nextgenhealthcare/connect/releases?per_page=10' to have interesting example data
3. In the new connectservice directory, run docker-compose build followed by
   docker-compose up -d
4. Build and run the server and client as normal. Observe notifications from github, and usage recorded to Elasticsearch (see http://localhost:5601/app/management/data/index_management/indices/)

Known issues:

• Images seem to work intermittently with the webview - not sure this is related to the server, probably client-side. Seems inconsistent.

Screenshots:

[mgaffigan]

Review notes from accidental merge in other PR:

from @jonbartels:

• connectservice/.dockerignore
  Why a second .dockerignore? Does the parent directory ignore file apply here?
  • I'm viewing this as something of a "sample" folder that I would assume someone copies out of tree - as such, I was trying to make it self-contained.
• connectservice/Readme.md
  OIE not Mirth :D
  • Updated.

from @kpalang:

• connectservice/Dockerfile
  suggestion: I'd use a newer node, 22 is latest LTS.
  • Good catch. Updated.
• connectservice/Dockerfile
  thought: If you have time and interest, look into the new hotness that is bun ;)
  • Mmm... bun. (still aiming for lowest-common denominator in samples)