`ctf` plugin: add `ctf::IntRangeSet` class template

`ctf` plugin: add `ctf::IntRangeSet` class template

This new class template is conceptually the same as the libbabeltrace2
equivalent (`bt2::CommonIntegerRangeSet`), but it's templated and avoids
having to make libbabeltrace2 function calls to access data.

That being said, the contains() and intersects() methods don't have
their libbabeltrace2 equivalent.

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Change-Id: I494dd1b236463eaf7c24d1143ed21afdd5e498b0
Reviewed-on: https://review.lttng.org/c/babeltrace/+/7923
Reviewed-by: Francis Deslauriers <francis.deslauriers@efficios.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/12252