feat: Add support for extended JSON in mongo node

[juandl]

Summary

This PR enhances the MongoDB node by adding support for Extended JSON (EJSON). With this update, users can now leverage EJSON features, such as converting values to specific types like "$date", making it easier to handle complex MongoDB operations directly within the node.

How to test:

1. Create or edit a MongoDB node in a workflow.
2. Input EJSON-formatted data, e.g., { "createdAt": { "$date": "2025-01-01T00:00:00Z" } }.
3. Execute the node and verify the data is processed correctly in MongoDB.

Note: EJSON.parse will handle both normal JSON and Extended JSON gracefully.

Related Linear tickets, GitHub issues, and Community forum posts

https://community.n8n.io/t/mongodb-date-objects-in-queries/40935/6
https://community.n8n.io/t/mongo-node-prefiltering-by-dates/4124

Review / Merge checklist

• PR title and summary are descriptive.

[CLAassistant]

All committers have signed the CLA.

[Joffcom]

Hey @juandl,

Thanks for the PR, We have created "GHC-623" as the internal reference to get this reviewed.

One of us will be in touch if there are any changes needed, in most cases this is normally within a couple of weeks but it depends on the current workload of the team.