Adds a new hook called 'post-seed' to allow for more granular triggering of plugins

[dakota002]

Hey, this is a pretty small addition, it would add a new hook called 'post-seed' to the sandbox hooks. This would be helpful in cases where there are actions that need to take place once the data is added.

For example:
I have a local dynamodb instance (Docker), and want to emulate the realistic behavior of my table-streams.
I also want to re-initialize fresh data from my sandbox-seed.json file each time I restart my app locally.

If my table streams are initialized/setup before the table is seeded, it will trigger as many times as there is relevant data in my seed.

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