Renamed some functions from utils

[serhii-lyshchenko]

What does this PR do?
It renames some functions from utils.

Where should the reviewer start?
It just renames few functions from utils, and replaces their name with new ones throughout the project.

How should this be manually tested?
It shouldn't cause build errors when this package and https://github.com/segmentio/analytics-ios are using together.

Any background context you want to provide?
It's impossible to use PostHog library together with Segment library on iOS. It happens because PostHog iOS package is based on Segment package, and they have duplicating function names which is causing failing of app build.

What are the relevant tickets?
https://github.com/PostHog/posthog-react-native/issues/2

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?

[mariusandra]

Thanks @serhey-dev for this! Apologies for the wait, yet 1.2.3 is now out with the change. I'll update the RN repo next.