Add option to qseow task tree command to filter which tasks are included in the tree

[mountaindude]

Select tasks to include by

New options to qseow task-get --output-format tree command:

--task-tag <tags...>
--task-id <ids...>

These options are already present for the useow task-get command, but previously only allowed when --output-format was set to table.

First version of this feature should find the topmost task in a task chain and then get all sub-tasks from there (even subtrees of the root node where the specified filter task are not present), even if a specified task is in the middle of the task chain.
Repeat for all tasks matching one of the filter criteria above.