feat: Add dart toggle edge function (#22)

backend/xmartchat_edge/.fvm/fvm_config.json

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+{
+  "flutterSdkVersion": "3.7.12",
+  "flavors": {}
+}

backend/xmartchat_edge/.gitignore

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+.dart_tool
+/functions/
+.fvm/flutter_sdk

backend/xmartchat_edge/README.md

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+# Supabase Edge Functions Example
+
+This template demonstrates how to run a [Supabase Edge Functions](https://supabase.com/docs/guides/functions) application via Dart Edge.
+
+## Getting Started
+
+Install the dependencies:
+
+```bash
+dart pub get
+```
+
+Start the application via Dart Edge CLU & the [`supabase` CLI](https://supabase.com/docs/guides/cli):
+
+```bash
+supabase init
+fvm dart run edge build supabase_functions
+supabase functions serve dart_edge
+```
+
+For more information, see the [Dart Edge documentation](https://docs.dartedge.dev).

backend/xmartchat_edge/analysis_options.yaml

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+# This file configures the static analysis results for your project (errors,
+# warnings, and lints).
+#
+# This enables the 'recommended' set of lints from `package:lints`.
+# This set helps identify many issues that may lead to problems when running
+# or consuming Dart code, and enforces writing Dart using a single, idiomatic
+# style and format.
+#
+# If you want a smaller set of lints you can change this to specify
+# 'package:lints/core.yaml'. These are just the most critical lints
+# (the recommended set includes the core lints).
+# The core lints are also what is used by pub.dev for scoring packages.
+
+include: package:lints/recommended.yaml
+
+# analyzer:
+#   exclude:
+#     - path/to/excluded/files/**
+
+# For more information about the core and recommended set of lints, see
+# https://dart.dev/go/core-lints
+
+# For additional information about configuring this file, see
+# https://dart.dev/guides/language/analysis-options

backend/xmartchat_edge/edge.yaml

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+supabase:
+    functions:
+      toggle_message: 'lib/toggle_message.dart'

backend/xmartchat_edge/lib/toggle_message.dart

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+import 'dart:convert';
+
+import 'package:edge_http_client/edge_http_client.dart';
+import 'package:supabase/supabase.dart';
+import 'package:supabase_functions/supabase_functions.dart';
+
+void main() {
+  final supabaseClient = SupabaseClient(
+    Deno.env.get('SUPABASE_URL')!,
+    Deno.env.get('SUPABASE_SERVICE_ROLE_KEY')!,
+    httpClient: EdgeHttpClient(),
+  );
+
+  SupabaseFunctions(fetch: (request) async {
+    final dynamic body = await request.json();
+    final messageId = body['id'];
+
+    final List<dynamic> messages =
+        await supabaseClient.from('messages').select('body').eq('id', messageId);
+
+    var newBody = (messages[0]['body'] as String).toggleCase();
+    await supabaseClient
+        .from('messages')
+        .update({'body': newBody}).eq('id', messageId);
+
+    return Response(jsonEncode({"message": "ok"}), status: 200);
+  });
+}
+
+extension _StringExtensions on String {
+  String toggleCase() => this == toUpperCase() ? toLowerCase() : toUpperCase();
+}