feat: Add support for sending CSAT surveys via templates (Whatsapp Twilio) (#13143)

Fixes
https://linear.app/chatwoot/issue/CW-6189/support-for-sending-csat-surveys-via-approved-whatsapp

---------

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Vinay Keerthi <11478411+stonecharioteer@users.noreply.github.com>
Co-authored-by: iamsivin <iamsivin@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

app/services/twilio/csat_template_api_client.rb

@@ -0,0 +1,68 @@
+class Twilio::CsatTemplateApiClient
+  def initialize(twilio_channel)
+    @twilio_channel = twilio_channel
+  end
+
+  def create_template(request_body)
+    HTTParty.post(
+      "#{api_base_path}/v1/Content",
+      headers: api_headers,
+      body: request_body.to_json
+    )
+  end
+
+  def submit_for_approval(approval_url, template_name, category)
+    request_body = {
+      name: template_name,
+      category: category
+    }
+
+    HTTParty.post(
+      approval_url,
+      headers: api_headers,
+      body: request_body.to_json
+    )
+  end
+
+  def delete_template(content_sid)
+    HTTParty.delete(
+      "#{api_base_path}/v1/Content/#{content_sid}",
+      headers: api_headers
+    )
+  end
+
+  def fetch_template(content_sid)
+    HTTParty.get(
+      "#{api_base_path}/v1/Content/#{content_sid}",
+      headers: api_headers
+    )
+  end
+
+  def fetch_approval_status(content_sid)
+    HTTParty.get(
+      "#{api_base_path}/v1/Content/#{content_sid}/ApprovalRequests",
+      headers: api_headers
+    )
+  end
+
+  private
+
+  def api_headers
+    {
+      'Authorization' => "Basic #{encoded_credentials}",
+      'Content-Type' => 'application/json'
+    }
+  end
+
+  def encoded_credentials
+    if @twilio_channel.api_key_sid.present?
+      Base64.strict_encode64("#{@twilio_channel.api_key_sid}:#{@twilio_channel.auth_token}")
+    else
+      Base64.strict_encode64("#{@twilio_channel.account_sid}:#{@twilio_channel.auth_token}")
+    end
+  end
+
+  def api_base_path
+    'https://content.twilio.com'
+  end
+end