Give - Recurring Donations 2.6.0

* Enhancement: Updated PayPal requests to use PayPal client framework to handle expired merchant access tokens

* Fix: Resolved subscription details page from failing when using manual donations

* Feature: Added Stripe Payment Element subscription module
* Feature: Enabled recurring by default in new forms created using the visual form builder
* Feature: Added Test Gateway subscription module
* Feature: Added PayPal Standard Gateway subscription module
* Feature: Used the new SubscriptionSynced command class on the Test Gateway and implement a way to display the synced data returned by it in the U
* Feature: Added PayPal Commerce subscription module
* Fix: Created renewals for Authorize and Square gateways with the proper status