feat: add authentication support with APIAuthType and APIAuthModel

- Introduced APIAuthType enum for various authentication methods.
- Created APIAuthModel with basic authentication fields.
- Updated RequestModel to include authType and authData.
- Implemented EditAuthType widget for selecting and managing authentication.
- Enhanced CollectionStateNotifier to handle authentication updates.

:wq

packages/apidash_core/lib/consts.dart

@@ -1 +1,24 @@
+import 'dart:convert';
+
+enum APIType {
+  rest("HTTP", "HTTP"),
+  graphql("GraphQL", "GQL");
+
+  const APIType(this.label, this.abbr);
+  final String label;
+  final String abbr;
+}
+
+enum APIAuthType {
+  none,
+  basic,
+  apiKey,
+  bearerToken,
+  jwtBearer,
+  digest,
+  oauth1,
+  oauth2,
+}
+
+
 enum EnvironmentVariableType { variable, secret }