Add a groups option for matched directory when using directories

[anthonysomerset]

Is there an existing issue for this?

• I have searched the existing issues

Feature description

Tangentially related to #10090

I can workaround that issue there by using the groups config, specifically in my case:

  - package-ecosystem: "terraform" # See documentation for possible values
    directories: 
      - "/*" # Location of package manifests
    groups:
      minor-and-patch:
        update-types:
          - "patch"
          - "minor"
    schedule:
      interval: "weekly"

this works but only gives me 1 PR, i would like to support a scenario where i could configure a groups config option that would create a PR for each matched directory, for example

  - package-ecosystem: "terraform" # See documentation for possible values
    directories: 
      - "/*" # Location of package manifests
    groups:
      matched-directories-group:
        group-by: directories
    schedule:
      interval: "weekly"

so for a given set of directories

azure-networking
azure-dns
azure-firewall

it would instead create 3 PR's, one for each folder with the folder mentioned in the PR subject