☂️ JArray refactor

[HosseinYousefi]

- [ ] Remove array related functions from dartjni.c accessors, instead use a mixin similar to JCallable, called JArrangable/JArrayable(!), so each type other than jvoidType creates their own JArray Seems not to be that important.

• How to convert JArray<jbyte> to Uint8List efficiently? #990
• Design an API to increase the functionality of arrays, including efficiently converting lists to arrays and vice versa.
• Direct Memory API #667
• Change the dart type of character array to int instead of String to be more consistent with the rest of the API
• Improve performance of JArray's operator []= #1097