Add feature to expose vars/defaults with include/import_role (#41330)

* First pass at making 'private' work on include_role, imports are always public

* Prevent dupe task execution and overwriting handlers

* New functionality will use public instead of deprecated private

* Add tests for public exposure

* Validate vars before import/include to ensure they don't expose too early

* Add porting guide docs about public argument and change to import_role

* Add additional docs about public and vars exposure to module docs

* Insert role handlers at parse time, exposing them globally

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