Auto exclude caching plugin folders

[Honemo]

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Description

THAT PR WON'T BE USED IN PRODUCTION.

No issue just an epic card for that special PR.

As the this repository doesn't have a composer.json file i had to use a require_once in backwpup.php. When that code will be used in a real PR we won't have to keep it.

There is no tests here. We will implement tests in the real PR when the feature will be add to the real repository.

Documentation

User documentation

Exclude some plugins folders from the list plugins to exclude from the backup. Exclude some plugins cache folders from the backup.

Technical documentation

Add a filter to allow plugins to exclude their cache folders from the backup. Add a filter to allow plugins to exclude their folder from the exclusion list in backwpup admin.

Type of change

• [ ] Enhancement (non-breaking change which improves an existing functionality).