feat: Added the ability to create Instagram channel (#11182)

This PR is part of https://github.com/chatwoot/chatwoot/pull/11054 to
make the review cycle easier.

app/controllers/concerns/instagram_concern.rb

@@ -0,0 +1,75 @@
+module InstagramConcern
+  extend ActiveSupport::Concern
+  include HTTParty
+
+  def instagram_client
+    ::OAuth2::Client.new(
+      client_id,
+      client_secret,
+      {
+        site: 'https://api.instagram.com',
+        authorize_url: 'https://api.instagram.com/oauth/authorize',
+        token_url: 'https://api.instagram.com/oauth/access_token',
+        auth_scheme: :request_body,
+        token_method: :post
+      }
+    )
+  end
+
+  private
+
+  def client_id
+    GlobalConfigService.load('INSTAGRAM_APP_ID', nil)
+  end
+
+  def client_secret
+    GlobalConfigService.load('INSTAGRAM_APP_SECRET', nil)
+  end
+
+  def exchange_for_long_lived_token(short_lived_token)
+    endpoint = 'https://graph.instagram.com/access_token'
+    params = {
+      grant_type: 'ig_exchange_token',
+      client_secret: client_secret,
+      access_token: short_lived_token,
+      client_id: client_id
+    }
+
+    make_api_request(endpoint, params, 'Failed to exchange token')
+  end
+
+  def fetch_instagram_user_details(access_token)
+    endpoint = 'https://graph.instagram.com/v22.0/me'
+    params = {
+      fields: 'id,username,user_id,name,profile_picture_url,account_type',
+      access_token: access_token
+    }
+
+    make_api_request(endpoint, params, 'Failed to fetch Instagram user details')
+  end
+
+  def make_api_request(endpoint, params, error_prefix)
+    response = HTTParty.get(
+      endpoint,
+      query: params,
+      headers: { 'Accept' => 'application/json' }
+    )
+
+    unless response.success?
+      Rails.logger.error "#{error_prefix}. Status: #{response.code}, Body: #{response.body}"
+      raise "#{error_prefix}: #{response.body}"
+    end
+
+    begin
+      JSON.parse(response.body)
+    rescue JSON::ParserError => e
+      ChatwootExceptionTracker.new(e).capture_exception
+      Rails.logger.error "Invalid JSON response: #{response.body}"
+      raise e
+    end
+  end
+
+  def base_url
+    ENV.fetch('FRONTEND_URL', 'http://localhost:3000')
+  end
+end