I'm afraid there's nothing out-of-the-box that will help you here.
If you're talking about pre-built Stash plugins then I'm afraid all you can do is either use the REST api and enable them with a script, or perhaps write a plugin that detects when a repository is added and enable them automatically.
If you're creating a new, specific hook for Stash you could consider writing a plugin using the low-level Hook interface which are automatically enabled by default. The downside is you would have to write your own configuration screen manually.
If you're talking about some custom-built post-receive hooks scripts then I believe you can add them to the global Git templates directory, which Git (and therefore Stash) uses when creating a new repository. The scripts should themselves be a symlink to another file so you can update them in a single location.
Even though this is closed, you might be interested in a few of the answeres here:
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