[Feature] Label History Model

### Is there an existing feature request for this?

- [X] I have searched the existing issues

### Describe the Feature

We use GitHub Labels to mark important milestones, and folks want to be able to quickly look up:

1. When labels were applied to PR's
2. How long PR's spent with a Label before the next was applied

### Describe alternatives you've considered

I've built out this type of model for Jira Issue Time in Status before, so my current plan is to just re-do that with PR/Issue Labels.

### Are you interested in contributing this feature?

- [ ] Yes.
- [X] Yes, but I will need assistance and will schedule time during your [office hours](https://calendly.com/fivetran-solutions-team/fivetran-solutions-team-office-hours) for guidance.
- [ ] No.

### Anything else?

_No response_

Usa il modello esistente Jira Issue Time in Status come riferimento di partenza, poiché l’issue propone di riutilizzare questo approccio per le label di pull request e issue. Verifica che il modello completato possa indicare quando sono state applicate le label e per quanto tempo ogni PR è rimasta con una label prima che venisse applicata quella successiva; non sono indicati file o test, quindi è necessaria la guida di un maintainer.

Scritto dal modello di indicizzazione a partire dal testo della issue.