lib: rename *_IS_TYPE() and *_HAS_ID() macros -> *_HAS_TYPE()

lib: rename *_IS_TYPE() and *_HAS_ID() macros -> *_HAS_TYPE()

This is to normalize this type of macro.

Since those macros check that a given object _has_ a given type, I
believe "has" makes more sense than "is" (you pass the instance, not the
type).

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Change-Id: I8b77443c3675d94ffc796b97eca2f773b71832db
Reviewed-on: https://review.lttng.org/c/babeltrace/+/3439