* [Enhance] Subscription module
* Added view documents from the subscription form
* Test cases
* documentation
* UI Test cases, fixes
* Removed child table in the subscription
* Provision to make subscription from the document, added subscription in the dashboard for the sales and buying flow
* added patch to make subscription from the recurring data
* Rename field subscriptio to subscription_id, added new test cases, remove recurring_document from controller
* renamed subscription_id to subscription
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