Add path, kind and lang to content front matter

[bep]

This relates to #11055 and #11540.

I'm planning on adding a canonical content path to Hugo, which is what you in Hugo 0.120.0 will get when you call .Path on Page.

For files, this will currently be determined from the file mounts + taxonomy setup, but a simple example may look like this:

content
├── _index.md
├── mysection
│   ├── _index.md
│   └── mybundle
│       ├── index.en.md
│       ├── index.jp.md
│       └── logo.png
└── p1.md

The path values the example above:

• / = home page
• /mysection
• /mysection/mybundle (with 2 translations)
• /mysection/mybundle/logo.png (a page resource)
• /mysection/p1

If we want to load non-file resources into the above structure (e.g. pages from JSON files), the path will be the key. So I thought we could establish that now in the "front matter schema" sooner rather than later.

With #11055 we get a separation of Hugo configuration and user defined variables in front matter, so front matter could look something like this:

---
title: "My page"
path: "/mysection/mybundle"
lang: "no"
date: 2023-01-01
params:
   foo: bar
---

Hello **world**.

The above would add a third translation of the bundle. The above may not be very useful (what do I know), but we at least have a structure we can build on.

Note that we already have

• url
• translationKey

Which may look similar to path, but have very different semantics.

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