feat: refactor list-item to hold data and make list components to hold clickup obj

[prgres]

Summary

Refactor of the list-based components (parts of the navigator widget).

• listitem.Item now has a data interface{} field for holding object data
• helper function for parsing listitem.Item to bubbles/list.Item are gone
• each component holds a whole clickup object instead of ID only
• removed leftover sre_index, index and other indexes related to setting defaults. This does not work yet but will be implemented someday https://github.com/prgres/clickup-tui/issues/23