Add Client class to Sentry Capacitor

[lucas-zimerman]

The latest SDK from JavaScript is not totally compatible with how Capacitor initialises the SDK, we should migrate the native initialisation to a new client class, just like react native is doing.

[github-actions]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀