feat: mmkv

[triniwiz]

Two versions of mmkv

MMKV is an efficient, small, easy-to-use mobile key-value storage framework used in the WeChat application

1. mmkv uses gradle & cocoapods for the dependencies
2. mmkv uses the cocoapods dependency for ios but on android an undocumented runtime feature which can be found here .

For mmkv-metal to work we will need this pr

The following are some sample call times for both versions

Action/Method Name	Package	time
Constructor	Regular	0.515ms
Constructor	Metal	0.056ms
contains	Regular	0.071ms
contains	Metal	0.006ms
set	Regular	1.879ms
set	Metal	0.765ms
getString	Regular	0.148ms
getString	Metal	0.009ms

Metal Version

Pros ✅	Cons :x:
Faster 🏎️ 💨	Will need to dive into to c++ 🤷🏽
Less Gc Calls	Has to be built against runtime compatible v8 version ... so if the runtime upgrade you need to rebuild 🕺🏽
	Increased lib size 😢 (could link against the rt vs libv8 💭 )

[triniwiz]

I also included a nice localStorage shim around both plugins

[timdoege]

Any chance this can be merged ... without a blog post? :)