Add ObjC example and add method annotations

[marandaneto]

What does this PR do?

Add ObjC example and add method annotations Otherwise ObjC calls would be super long and repetitive.

Where should the reviewer start?

How should this be manually tested?

Any background context you want to provide?

What are the relevant tickets?

Screenshots or screencasts (if UI/UX change)

Questions:

• Does the docs need an update?
• Are there any security concerns?
• Do we need to update engineering / success?