refactor(plugin): modernize plugin architecture and improve type definitions

- Update package.json with modern build tooling and dependencies
- Streamline and enhance TypeScript definitions for better type safety
- Reorganize plugin structure for better maintainability
- Add comprehensive interface definitions for notification features
- Implement proper build configuration with rollup
- Update tsconfig.json for stricter type checking and ES2020 modules

Breaking Changes:
- Changed module structure to use ES modules
- Updated interface definitions with stricter typing
- Removed redundant notification options
- Simplified API surface while maintaining core functionality

Dependencies:
- Upgrade @capacitor dependencies to v5.7.8
- Add rollup and typescript build tools
- Update test framework configuration

rollup.config.js

@@ -0,0 +1,25 @@
+import typescript from 'rollup-plugin-typescript2';
+
+export default {
+  input: 'src/index.ts',
+  output: [
+    {
+      file: 'dist/plugin.js',
+      format: 'cjs',
+      sourcemap: true
+    },
+    {
+      file: 'dist/esm/index.js',
+      format: 'es',
+      sourcemap: true
+    }
+  ],
+  external: ['@capacitor/core'],
+  plugins: [
+    typescript({
+      tsconfig: './tsconfig.json',
+      clean: true,
+      useTsconfigDeclarationDir: true
+    })
+  ]
+};