[Feature]: Would very useful to have context graph metadata to have modified dates

[ShravanSunder]

Feature Request

It would be really useful for blugin development for context.project.graphs[graphRef.graphId].metadata or the nodes graph.nodes to have date when that subgraph was last updated or modified.

i have caching in my plugin and i'd like to invalidate it when the grpah is updated.

As a workaround i'm doing a hash of JSON.stringify(graph.nodes.map(m => m.data))

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