QuPath doesn't support some channel combinations through Bio-Formats

[petebankhead]

Bug report

Describe the bug
Bio-Formats can support more ways of handling channels than QuPath can currently read.
Specifically, this includes multiple channels with multiple samples-per-pixel in each channel.

The effective number of channels comes from adding all the samples across all the channels.

This problem turned up with a polarised light scan in CZI format: https://forum.image.sc/t/qupath-cant-open-polarized-light-scans/65951

To Reproduce
Awkward... Can likely only be reproduced using an image where

metadata.getChannelCount(series) < nChannels

and where the extra channels can be accessed via metadata.getChannelSamplesPerPixel(series, channelInd).

Expected behavior
QuPath properly opens all channel combinations supported by Bio-Formats.

Desktop (please complete the following information):

• OS: All
• QuPath Version v0.3.2 and all previous

Additional context
When this occurs, we could have mixed modes... like brightfield & something else. So a satisfying fix might require supporting multi-modal images.