fix: handle static abstract handlers correctly

Migrate to TUnit

Add collection return support to ScanForTypes attribute (#55)

Filter types by CustomHandler generic constraints (#48)

fix: Filter out open generics when used with CustomHandler (#47)

Find CustomHandler or KeySelector methods if they are defined in base…

… types (#42)

fix: Allow instance CustomHandler method if scan method is instance (#40

)

feat: Resolve additional CustomHandler type arguments from matching t…

…ype (#39)

fix: Verify types are accessible (#38)

Add multiple registrations if service implements open generic interfa…

…ce more than once (#36)