New architecture (#33)

## Description
Migrated react native executorch library to new architecture,
implemented new version of event emitters offered by new architecture,
adjusted native code to implement codegen generated classes also updated
react native version to 0.76 and changed folder structures so it's more
self explanatory.

### Type of change
- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [x] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] Documentation update (improves or adds clarity to existing
documentation)

### Tested on
- [x] iOS
- [x] Android

### Testing instructions
<!-- Provide step-by-step instructions on how to test your changes.
Include setup details if necessary. -->

### Screenshots
<!-- Add screenshots here, if applicable -->

### Related issues
<!-- Link related issues here using #issue-number -->

### Checklist
- [x] I have performed a self-review of my code
- [x] I have commented my code, particularly in hard-to-understand areas
- [ ] I have updated the documentation accordingly
- [x] My changes generate no new warnings

### Additional notes
<!-- Include any additional information, assumptions, or context that
reviewers might need to understand this PR. -->

Author: NorbertKlockiewicz

android/build.gradle

@@ -63,7 +63,7 @@ android {
   defaultConfig {
     minSdkVersion getExtOrIntegerDefault("minSdkVersion")
     targetSdkVersion getExtOrIntegerDefault("targetSdkVersion")
-
+    buildConfigField("boolean", "IS_NEW_ARCHITECTURE_ENABLED", isNewArchitectureEnabled().toString())
   }
 
   buildTypes {
@@ -98,4 +98,3 @@ dependencies {
   implementation(files("libs/executorch-llama.aar"))
   implementation("com.squareup.okhttp3:okhttp:4.9.2")
 }
-