feat(issues): add issues usecase submodule

1mod create;

2mod delete;

3mod get;

4mod helpers;

5mod list;

6mod update;

8pub use create::create_collection;

9pub use delete::delete_collection;

10pub use get::get_collection;

11pub use helpers::{ensure_default_collection, load_collection, load_default_collection};

12pub use list::list_collections;

13pub use update::update_collection;