Add is_temp, is_tempfile and is_tempdir predicates

[bpj]

Please add is_temp (and is_tempfile and is_tempdir if possible) predicate(s).

They would, of course, return true if the path object represents a temporary file or directory, as determined by whether it contains a File::Temp object.

My use case is that I cache paths to non-temporary files/directories (as strings) to an external YAML file, but skip temp files/dirs so I would like a way to determine whether a path is a temp which doesn't throw if it is not like cached_temp does.

I could of course (and do currently) use Try::Tiny or an eval block but that should ideally involve checking that it dies for the right reason, and that is both a lot of hassle for doing such a thing and a blunt tool.