(feat) added hook for createApiKeysWorkflow

[IgorKhomenko]

What
This commit introduces the apiKeysCreated hook to thecreateApiKeysWorkflow.

Why
The hook was missing and necessary to improve the workflow's extensibility.

How
Added the apiKeysCreated hook and updated related logic within the workflow.

Testing

1. Create new medusa project via create-medusa-app
2. Connect this custom branch of medusa to it
3. Create src/workflows/hooks/api-keys-created.ts file with the following content:

import { createApiKeysWorkflow } from "@medusajs/medusa/core-flows"

createApiKeysWorkflow.hooks.apiKeysCreated(
  (async ({ apiKeys, additional_data }, { container }) => {
    console.log({apiKeys})
  })
)

4. Create new admin account and create there a new API key
5. The log should be displayed in terminal

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[IgorKhomenko]

related to #10383