Add ConvertKit_Resource_Account Resource Class

[n7studios]

Summary

Adds a new resource account to cache the result of the account API call.

This will later be used by the Abilities API / MCP for gating MCP access based on the account's plan type. It can also be used in the future to determine whether creators may need to upgrade from their free plan to a paid one based on their subscriber count etc, without needing to repeatedly query the API.

Testing

• ResourceAccountTest: Test the account resource

Checklist

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

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