Minor Changes

• #12047 21b5e80 Thanks @rgodha24! - Adds a new optional parser property to the built-in file() loader for content collections to support additional file types such as toml and csv.

  The file() loader now accepts a second argument that defines a parser function. This allows you to specify a custom parser (e.g. toml.parse or csv-parse) to create a collection from a file's contents. The file() loader will automatically detect and parse JSON and YAML files (based on their file extension) with no need for a parser.

  This works with any type of custom file formats including csv and toml. The following example defines a content collection dogs using a .toml file.

  [[dogs]]
  id = "..."
  age = "..."
  
  [[dogs]]
  id = "..."
  age = "..."
  ```...