[FEATURE] Add Data API support with automatic routing metadata header…

[danny-beton-lrn]

Add Data API Support to Node.js SDK
This PR adds comprehensive Data API support to the Learnosity Node.js SDK + add the new request header metadata and updated the quickstart demo.

What's New

• New DataApi class ( lib/DataApi.js) - Routing layer for making authenticated Data API requests
• Pagination support - requestIter() and resultsIter() async generators for handling multi-page responses
• Flexible HTTP adapter - Supports custom HTTP clients (defaults to native fetch)
• Routing metadata headers - Automatic X-Learnosity-Consumer, X-Learnosity-Action, and X-Learnosity-SDK headers
• Comprehensive tests - 29 passing tests (unit + integration) with 100% coverage
• Documentation - Updated README, REFERENCE.md, and interactive quickstart demo

[michael-linnane-lrn]

Reviewing now

[michael-linnane-lrn]

Thanks for adding robust tests and docs here @danny-beton-lrn. Just the one comment regarding the codacy warning

[michael-linnane-lrn]

🤓 Nit: This might be better served with a specific error variable rather than making it fit to the demo1_output typing. It would also simplify the conditional logic above by replacing each of the

<% if (demo1_output.length > 0 && demo1_output[0].error) { %>
            <div class="error">Error: <%= demo1_output[0].error %></div>
        <% } else { %>

with something like

<% if (demo1_error) { %>
            <div class="error">Error: <%= demo1_error %></div>
        <% } else { %>
...
<% if (demo2_error) { %>
            <div class="error">Error: <%= demo2_error %></div>
        <% } else { %>

Increases space usage but improves readability

[danny-beton-lrn]

I've made that change, thanks @michael-linnane-lrn 👍

[michael-linnane-lrn]

👏 Praise: Excellent documentation 🙌

[michael-linnane-lrn]

The only comment left from me is a nit comment. Non blocking so feel free to ignore if you think so

[georgios-kanellopoulos-lrn]

Nice work Danny! 👏

I just left a small suggestion.

[michael-linnane-lrn]

LGTM @danny-beton-lrn 🚢