Add Dependency List Vuex store

What does this MR do?

This adds the Vuex store for the Dependency List MVC. It's one of a handful of MRs that will make up the frontend portion of the feature.

This should satisfy the relevant requirements listed in #10075 (closed), #11059 (closed) and #11397 (closed).

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation created/updated or follow-up review issue created
• Code review guidelines
• [-] Style guides
• Separation of EE specific content

Performance and testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers