[WIP] Ability to mark assets as inactive

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original issue description:

Assets (Datasets and Prompt Templates) can be created. They are immutable, can't be deleted or edited. Updating them creates a new version of the asset.

Add a new feature to mark an asset inactive. Steps -

1. Add new column to store if an asset is active or inactive.
2. Extend Asset class to add the capability to mark an asset active or inactive.
3. On the UI, add a toggle to show/Hide inactive assets.

Fixes #63.

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