Greatly simplifies how Price.amountMicros is determined on iOS.

[JayShortway]

Since PHC did not expose the actual price amount on iOS, we were reconstructing it by parsing the formatted price string. Besides being very brittle, this might also be the cause of https://github.com/RevenueCat/purchases-kmp/issues/161, as we return 0 if the price formatter is null. The meat of this PR is in Price.ios.kt.

Note: this is ready for review. It's just dependent on a few external factors:

Blockers

• [x] https://github.com/RevenueCat/purchases-hybrid-common/pull/911
• [x] A PHC release with ☝️
• [x] Updating this PR with the new PHC version number.

[tonidero]

I just merged the PHC bump in #174, so we should rebase this PR @JayShortway

[JayShortway]

@tonidero Thanks, done!