:children_crossing: Handle Multidimensional `Features` in `WSIReader`

[behnazelhaminia]

• Adds support for multichannel inputs e.g., image masks, feature maps etc. Fixes #609 and #610

[review-notebook-app[bot]]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

---

Powered by ReviewNB

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.89%. Comparing base (027ffdd) to head (0c78b40).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #742 +/- ## =========================================== - Coverage 99.91% 99.89% -0.03% =========================================== Files 69 69 Lines 8525 8530 +5 Branches 1639 1641 +2 =========================================== + Hits 8518 8521 +3 - Misses 0 1 +1 - Partials 7 8 +1 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.