Add docs for GNN import and export

[antejavor]

Release note

This PR documents a new query module that transforms the GNNs into appropriate outside frameworks (PyG and TF geometric).

Related product PRs

PRs from product repo this doc page is related to:
memgraph/memgraph#3803

Checklist:

• Add appropriate milestone (current release cycle)
• Add bugfix or feature label, based on the product PR type you're documenting
• Make sure all relevant tech details are documented
  • Update reference pages (e.g. clauses, functions, flags, experimental, monitoring, Cypher differences)
  • Search for the feature you are working on (mentions) and make updates if needed
  • Provide a basic example of usage
  • In case your feature is an Enterprise one, list it under ME page and mark its page with Enterprise (example).
• Check all content with Grammarly
• Perform a self-review of my code
• The build passes locally
• My changes generate no new warnings or errors

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Project	Deployment	Actions	Updated (UTC)
documentation	Ready	Preview, Comment	Mar 30, 2026 8:10am