Add new 'wc_admin_reports_path' filter to reports
Add filter to allow for changing of the report class files.

This will allow 3rd party plugins to use this function to extend the
reporting. Currently this can only include files in the woocommerce plugin
directory itself.
Add new 'wc_admin_reports_path' filter with name
Add $name to filter to be able to use the original passed value as well.
Merge pull request #5447 from ChuckMac/report_filter

[2.2] Add new 'wc_admin_reports_path' filter to reports