Support for x86 and ARMv7

[slainless]

I noticed that MMKV v1.3.4 is used as dependency in this package. However, MMKV officially drops support for x86 and ARMv7 starting from 1.3.5 and building with 1.3.4 doesn't output any libmmkv for both arch.

Can you consider switching to another library or add compatibility for devices with older or lower hardware specs?

[mitchdowney]

I also learned recently that, after upgrading to @kesha-antonov/react-native-background-downloader, that we've received a number of reports of people saying our app no longer works on Android. Apparently it is related to the mmkv / armv7 issue.