feat: support hasMany virtual relationship fields

[r1tsuu]

This PR adds support for the following configuration:

const config = {
  collections: [
    {
      slug: 'categories',
      fields: [
        {
          name: 'title',
          type: 'text',
        },
      ],
    },
    {
      slug: 'posts',
      fields: [
        {
          name: 'title',
          type: 'text',
        },
        {
          name: 'categories',
          type: 'relationship',
          relationTo: 'categories',
          hasMany: true,
        },
      ],
    },
    {
      slug: 'examples',
      fields: [
        {
          name: 'postCategoriesTitles',
          type: 'text',
          virtual: 'post.categories.title',
          // hasMany: true - added automatically during the sanitization
        },
        {
          type: 'relationship',
          relationTo: 'posts',
          name: 'post',
        },
        {
          name: 'postsTitles',
          type: 'text',
          virtual: 'posts.title',
          // hasMany: true - added automatically during the sanitization
        },
        {
          type: 'relationship',
          relationTo: 'posts',
          name: 'posts',
          hasMany: true,
        },
      ],
    },
  ],
}

In the result:
postsTitles - will be always populated with an array of posts titles.
postCategoriesTitles - will be always populated with an array of the categories titles that are related to this post

The virtual text field is sanitizated to hasMany: true automatically, but you can specify that manually as well.

[github-actions]

📦 esbuild Bundle Analysis for payload

This analysis was generated by esbuild-bundle-analyzer. 🤖

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Details

Next to the size is how much the size has increased or decreased compared with the base branch of this PR.

• ‼️: Size increased by 20% or more. Special attention should be given to this.
• ⚠️: Size increased in acceptable range (lower than 20%).
• ✅: No change or even downsized.
• 🗑️: The out file is deleted: not found in base branch.
• 🆕: The out file is newly found: will be added to base branch.