feat(rca): update items and investigation params

[kdelemme]

Resolves https://github.com/elastic/kibana/issues/190334

Summary

This PR introduces an API for updating an item, and an API for updating an investigation (title, params and status for now). I've also handled the change of the time range in this PR, which is synced with the backend, and re-render the items.

Next thing I want to refactor is the timeRange to a dateString, to make it easier to use it from the frontend (using ISO string)

https://github.com/user-attachments/assets/992ae5d6-65b3-496f-b6c2-faecdc2920a0