Prepare the module to work with EntityShare.

Problem/Motivation

The module isn't compatible with JSONAPI or Entity Share as it lacks two crucial fields (UUID, Default Langcode).

Steps to reproduce

1. You cannot find the Entity type (Custom token) when you want to create a channel for the entity share.
2. An error occurs when you attempt to visit this link: "/jsonapi/token_custom/custom" due to missing fields.

Proposed resolution

Add the missing fields and include a hook update to update the uuid for all values.

Remaining tasks

User interface changes

API changes

Data model changes