Add option to display frontmatter more easily in config

[lsilberstein]

Is your feature request related to a problem? Please describe.
The Contentmeta component currently only displays a few informations such as Date and reading time. People often ask for options to display their own fronmatter fields, such as

discord message

Describe the solution you'd like
An easy solution could be to add option field to the contentmeta component.

frontmatter?: {
    fieldName: string
}

Describe alternatives you've considered
Another alternative would be to write a whole new table view component that could be used in the layout config.

Additional context
I actually built a similar system for my own space which you can reference here