Support manual hook injection

[Mikescops]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the feature has not already been requested

🚀 Feature Proposal

I have multiple hooks during the preValidation step including hooks that modify the content or run a signature check on the content. Because the hook is registered at the instance boot and not at the route level i cannot decide on the hooks order.

fastify-multipart/index.js

Line 70 in 83aea97

fastify.addHook('preValidation', async function (req) {

Would it be possible to put the hook in a dedicated exported function and add a new parameter to allow to manually load the hook via the function?

Motivation

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Example

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