Add Tapir to Bijectors tests.

[yebai]

Let's add Tapir to the Bijectors tests.

Related: TuringLang/AdvancedVI.jl#63

[yebai]

@torfjelde @sethaxen do you know what is required to add Tapir to AD testing CI?

cc @willtebbutt

[willtebbutt]

FWIW I'm also very happy to add an additional integration test suite to Tapir which runs Tapir on examples in Bijectors.jl, particularly if you have a handy list of functions that I can attempt to differentiate.

[yebai]

Fixed by #319