add config option to include the changes of the dependent packages in the changelog of the package

[MarcoIeni]

Motivations

At the moment, the changelogs contain only the changes of the current package.
It would be nice to add the option to include the changes of all dependent packages of the workspace (not dev-dependencies).

For monorepos, if you go with the single changelog strategy, the changelog will contain all the changes of your "main" crate and its dependencies.

Solution

add the commits of the dependent dependencies here.
Remove duplicates.

Questions

should we include just the changes of direct dependencies? Or should this also be recursive?

For example if we the following dependency graph:

A -> B -> C.

Should updates of the local dependency C be in the changelog of package A?

Answer: we could start with a "direct dependency" approach, i.e. only include the changes of B.

I'm still not sure if this makes sense 🤔 Feedback, anyone?

[MarcoIeni]

Another option: let's have a list of include in the changelog where we explicitly list packages we want to include changes.

For example, in release-plz I would use it to include the changes of release-plz-core.

Since we have so many option for the changelog, we should create a subsection for it.

EDIT: this is my preferred option.