Add iOS to list of supported performance monitoring SDKs

[bruno-garcia]

This is a manually curated list of supported SDKs:

https://docs.sentry.io/product/performance/getting-started/

As iOS goes into GA we need to add it to the list under the Mobile section.

[PeloWriter]

Another reason that an automated SDK feature list would be valuable.

[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 🥀

[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 🥀

[PeloWriter]

This was fixed in #3468