feat: Add message support for input_select type in LINE (#11628)

# Pull Request Template

## Description

Added input_select message type support for LINE

## Type of change

Please delete options that are not relevant.

- [ ] Bug fix (non-breaking change which fixes an issue)
- [X] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality not to work as expected)
- [ ] This change requires a documentation update

## How Has This Been Tested?

add testcase. and test manually by myself


## Checklist:

- [X] My code follows the style guidelines of this project
- [X] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

---------

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/services/line/send_on_line_service.rb

@@ -22,6 +22,14 @@ class Line::SendOnLineService < Base::SendOnChannelService
   end
 
   def build_payload
+    if message.content_type == 'input_select' && message.content_attributes['items'].any?
+      build_input_select_payload
+    else
+      build_text_payload
+    end
+  end
+
+  def build_text_payload
     if message.content && message.attachments.any?
       [text_message, *attachments]
     elsif message.content.nil? && message.attachments.any?
@@ -52,6 +60,43 @@ class Line::SendOnLineService < Base::SendOnChannelService
     }
   end
 
+  # https://developers.line.biz/en/reference/messaging-api/#flex-message
+  def build_input_select_payload
+    {
+      type: 'flex',
+      altText: message.content,
+      contents: {
+        type: 'bubble',
+        body: {
+          type: 'box',
+          layout: 'vertical',
+          contents: [
+            {
+              type: 'text',
+              text: message.content
+            },
+            *input_select_to_button
+          ]
+        }
+      }
+    }
+  end
+
+  def input_select_to_button
+    message.content_attributes['items'].map do |item|
+      {
+        type: 'button',
+        style: 'link',
+        height: 'sm',
+        action: {
+          type: 'message',
+          label: item['title'],
+          text: item['value']
+        }
+      }
+    end
+  end
+
   # https://developers.line.biz/en/reference/messaging-api/#error-responses
   def external_error(error)
     # Message containing information about the error. See https://developers.line.biz/en/reference/messaging-api/#error-messages