migrate: react-native-localization => react-native-localize

[hyochan]

• Removed react-native-localization.
• Migrated to react-native-localize.
• Update readme.
• Add mock for react-native-localize.ts.

[codecov[bot]]

Codecov Report

Merging #115 into master will decrease coverage by 3.63%. The diff coverage is 80%.

@@           Coverage Diff            @@
##           master   #115      +/-   ##
========================================
- Coverage   88.63%    85%   -3.64%     
========================================
  Files          12     11       -1     
  Lines         132    140       +8     
  Branches       16     14       -2     
========================================
+ Hits          117    119       +2     
- Misses          8     11       +3     
- Partials        7     10       +3