Add 'add_filter_share_permissions' method and support in create_filter()

[ABizzinotto]

Addresses issue #1629

This PR adds a add_filter_share_permissions method to the client, supporting the filter/{id}/permission endpoint (https://docs.atlassian.com/software/jira/docs/api/REST/9.3.1/#api/2/filter-addSharePermission).

Also add support for it in the create_filter() method, allowing users to pass on permissions to add when creating a new filters.

[Mazorius]

I look forward to this solution as I need this as well :)

Any idea what is open? Cannot see the logs? Will got that released.