Handling of input data before the end-of-stream tag that cannot be processed due to port/block constraints

[wirew0rm]

The current handling in this situation is in an incomplete and inconsistent state:

• processes last chunk before EoS without considering constraints
• but only port constraints and not resampling constraints
• no way to customize that behavior

After some discussion with me, @RalphSteinhagen and @drslebedev the following implementation is proposed:

• by default, drop last samples(and tags except EoS of course) that violate the constraints (resampling, stride & port min/max)
• provide an optional customisation point: Derrived::processBulkEpilogue(args same as process bulk modulo std::span vs ConsumableSpan)
  • that way, the regular process function can be kept free of the branch for handling incomplete data
  • it will provide all available data on all ports before the end of stream tag as arguments and allows to publish or not to publish samples at the implementers discretion
  • need to add additional unit tests for the extension point

For implementation, the default behaviour is changed in #366 to what is described above, implementing the customisation point will be a separate task to be tackled after the ASYNC handling.