Feature: Support file type messages on widget and dashboard (#659)

- Adds support for file upload

Co-authored-by: Pranav Raj Sreepuram <pranavrajs@gmail.com>
Co-authored-by: Sojan <sojan@pepalo.com>

app/helpers/file_type_helper.rb

@@ -0,0 +1,14 @@
+module FileTypeHelper
+  def file_type(content_type)
+    return :image if [
+      'image/jpeg',
+      'image/png',
+      'image/svg+xml',
+      'image/gif',
+      'image/tiff',
+      'image/bmp'
+    ].include?(content_type)
+
+    :file
+  end
+end