feat: add support for custom templates

[manchenkoff]

This PR is a proposal rather than final implementation.

🔗 Linked issue

Resolves #56

📚 Description

This PR using new hook introduced in nuxt/nuxt#35345 for collecting available file templates from client modules.

This allows clients to define custom set of files to generate via pnpm nuxt add-template <custom-template-from-module> filename.

Example of the client module:

import { defineNuxtModule } from '@nuxt/kit'

export default defineNuxtModule({
  meta: {
    name: 'custom-component',
  },
  setup(_options, nuxt) {
    nuxt.hook('templates:extend', (templates: Record<string, unknown>) => {
      templates['custom-component'] = ({ name }: { name: string }) => ({
        path: `components/custom/${name}.vue`,
        contents: `\
<template>
  <div>
    {{ name }}
  </div>
</template>

<script setup lang="ts">
defineProps<{name: string}>()
</script>`,
      })
    })
  },
})

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

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  Coverage        ?   52.47%           
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  Files           ?       49           
  Lines           ?     1214           
  Branches        ?      339           
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  Partials        ?      104           

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[pkg-pr-new]

• nuxt-cli-playground

  npm i https://pkg.pr.new/create-nuxt@1340
  

  npm i https://pkg.pr.new/nuxi@1340
  

  npm i https://pkg.pr.new/@nuxt/cli@1340
  

commit: 7efa328

[codspeed-hq]

Merging this PR will not alter performance

✅ 2 untouched benchmarks

---

_{Comparing manchenkoff:extend-templates-cli (7efa328) with main (fab0173)}