Chore: Update example app (mobiles) to use the latest of react native (#552)

* Update react and react-native packages

* Setup new react-native environment

* Update iOS project

* Adjust gitignore to new rn example project

* Update android project

* Fix ESLint version for linting checks to pass

* Fix the Slider's styles type

* Update iOS workspace

Author: BartoszKlonowski

example/.gitignore

@@ -31,6 +31,8 @@ local.properties
 *.iml
 *.hprof
 .cxx/
+*.keystore
+!debug.keystore
 
 # node.js
 #
@@ -62,3 +64,9 @@ buck-out/
 # Ruby / CocoaPods
 /ios/Pods/
 /vendor/bundle/
+
+# Temporary files created by Metro to check the health of the file watcher
+.metro-health-check*
+
+# testing
+/coverage

example/Gemfile

@@ -1,6 +1,7 @@
 source 'https://rubygems.org'
 
 # You may use http://rbenv.org/ or https://rvm.io/ to install and use this version
-ruby '2.7.5'
+ruby ">= 2.6.10"
 
-gem 'cocoapods', '~> 1.11', '>= 1.11.2'
+gem 'cocoapods', '~> 1.13'
+gem 'activesupport', '>= 6.1.7.3', '< 7.1.0'