Bug fixes

This release is a big refactor using core's daterange field type instead of daterange_all_day field type.

Adding better error handling based on the response from Watson.

Fixing serialization of checkboxes and multiselect fields.

Removing unused code and fixing coding standards.

• Review asset exporting and entity preview PR
• Make the acquia_contenthub.client service public.
• Modules support new service webhook status.
• Last set of changes to clarify and simplify various elements of the code.
• Removing the webhook status checking code from the controller in favor of the new code in the library.
• Making sure all references to the messenger property use the method instead.
• Converting over to the new webhook object from the library.

* Issue #3064249 by gun_dose: When checked "multiple" and disable "implode", view always shows first item
* Refactoring of the code using drupol/drupal-conventions package.

Fix error 500 when service is not available.