DSB::Path::Tiny

Hi, I've added `Path::Tiny` support for `Data::Stream::Bulk`. The implementation (code and tests) is a copycat of `Path::Class` variant. The most visible difference is the fact that `Path::Tiny` always cleans the stringified object, e.g. `./Changes` vs. `Changes`.

This PR is part of my [advent quest](https://questhub.io/realm/perl/quest/547b4202070ccf750d00010e).

Cheers,
Sergey.