feat: Ability to improve drafts in the editor using GPT integration (#6957)

ref: https://github.com/chatwoot/chatwoot/issues/6436
fixes: https://linear.app/chatwoot/issue/CW-1552/ability-to-rephrase-text-in-the-editor-using-gpt-integration

---------

Co-authored-by: Sojan <sojan@pepalo.com>
Co-authored-by: Nithin David Thomas <1277421+nithindavid@users.noreply.github.com>

lib/integrations/openai/processor_service.rb

@@ -0,0 +1,39 @@
+class Integrations::Openai::ProcessorService
+  pattr_initialize [:hook!, :event!]
+
+  def perform
+    rephrase_message if event['name'] == 'rephrase'
+  end
+
+  private
+
+  def rephrase_body(tone, message)
+    {
+      model: 'gpt-3.5-turbo',
+      messages: [
+        { role: 'system', content: "You are a helpful support agent. Please rephrase the following response to a more #{tone} tone." },
+        { role: 'user', content: message }
+      ]
+    }.to_json
+  end
+
+  def rephrase_message
+    response = make_api_call(rephrase_body(event['data']['tone'], event['data']['content']))
+    JSON.parse(response)['choices'].first['message']['content']
+  end
+
+  def make_api_call(body)
+    headers = {
+      'Content-Type' => 'application/json',
+      'Authorization' => "Bearer #{hook.settings['api_key']}"
+    }
+
+    response = HTTParty.post(
+      'https://api.openai.com/v1/chat/completions',
+      headers: headers,
+      body: body
+    )
+
+    response.body
+  end
+end