feat: include account_id in contact and inbox JSON responses (#182)

* test: include account_id in inbox response validation

app/views/api/v1/models/_contact.json.jbuilder

@@ -10,6 +10,7 @@ json.thumbnail resource.avatar_url
 json.custom_attributes resource.custom_attributes
 json.last_activity_at resource.last_activity_at.to_i if resource[:last_activity_at].present?
 json.created_at resource.created_at.to_i if resource[:created_at].present?
+json.account_id resource.account_id
 # we only want to output contact inbox when its /contacts endpoints
 if defined?(with_contact_inboxes) && with_contact_inboxes.present?
   json.contact_inboxes do

app/views/api/v1/models/_inbox.json.jbuilder

@@ -3,6 +3,7 @@ json.avatar_url resource.try(:avatar_url)
 json.channel_id resource.channel_id
 json.name resource.name
 json.channel_type resource.channel_type
+json.account_id resource.account_id
 json.greeting_enabled resource.greeting_enabled
 json.greeting_message resource.greeting_message
 json.working_hours_enabled resource.working_hours_enabled

app/views/api/v1/models/_inbox_slim.json.jbuilder

@@ -3,4 +3,5 @@ json.avatar_url resource.try(:avatar_url)
 json.channel_id resource.channel_id
 json.name resource.name
 json.channel_type resource.channel_type
+json.account_id resource.account_id
 json.provider resource.channel.try(:provider)

spec/controllers/api/v1/accounts/contacts_controller_spec.rb

@@ -80,7 +80,7 @@ RSpec.describe 'Contacts API', type: :request do
         expect(contact_emails).to include(contact.email)
         first_inbox = contact_inboxes[0]['inbox']
         expect(first_inbox).to be_a(Hash)
-        expect(first_inbox).to include('id', 'channel_id', 'channel_type', 'name', 'avatar_url', 'provider')
+        expect(first_inbox).to include('id', 'channel_id', 'channel_type', 'account_id', 'name', 'avatar_url', 'provider')
 
         expect(first_inbox).not_to include('imap_login',
                                            'imap_password',