chore: modify cli changelog script to parse subjects and group them appropriately

[nlf]

for example, if the commit is feat(arborist): added something then we should be able to identify the commit as being related to an arborist deps commit, and place the feat commit as a bullet point there instead of at the top level

current behavior:

### Features

  * feat(arborist): added a feature

### Dependencies

  * deps: `@npmcli/[email protected]`

desired behavior:

### Dependencies

* deps: `@npmcli/[email protected]`
  * feat(arborist): added a feature