feat(plugin-mcp): adds a PayloadRequest to custom tool, prompt, and resource handlers

[kendelljoseph]

In order to be able to use the payload object or the same access control strategy in our custom tools without having to do additional lookups, we now included a req in the custom tool handlers.

• Adds a req to the custom tool handlers.

Previously handlers did not include a req argument:

handler: async (args: Record<string, unknown>) => {}

Now they do!

handler: async (args: Record<string, unknown>, req:PayloadRequest, _extra) => {}

[github-actions]

📦 esbuild Bundle Analysis for payload

This analysis was generated by esbuild-bundle-analyzer. 🤖
This PR introduced no changes to the esbuild bundle! 🙌

[DanRibbens]

Is it too late to move to arg objects or would it be breaking?

[github-actions]

🚀 This is included in version v3.65.0