🐛 Fix `TIFFWSIReader` `read_bound`

[vqdang]

Emergency bugfix per @John-P request. The culprit is reading bound doesn't use the adjusted bounds as have been done in OpenSlideReader.

[shaneahmed]

Thanks @vqdang and @John-P Please can you add a simple test to make sure this produces expected results.

[codecov[bot]]

Codecov Report

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

Project coverage is 99.86%. Comparing base (621a857) to head (a2c8afe). Report is 1 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #777 +/- ## =========================================== - Coverage 99.89% 99.86% -0.04% =========================================== Files 69 69 Lines 8650 8650 Branches 1653 1654 +1 =========================================== - Hits 8641 8638 -3 - Misses 1 4 +3 Partials 8 8 ```

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[shaneahmed]

Please can you also check if it is related to #499 ?

[Abdol]

I have added a simple test but not completely sure if it fully tests for the fixed bug. @vqdang @John-P I'd appreciate it if you can give the test a review.

[Abdol]

A kind follow up @vqdang @John-P. I'd appreciate it if you can give the test a review. Thanks!

[measty]

I think this also needs a fix along similar lines for read_rect

[Abdol]

A kind follow up @vqdang @John-P. I'd appreciate it if you can give the test a review. Thank you!

[measty]

I've added a few changes to this PR too.

• fix for read_rect along similar lines to read_bounds (it was bugged in the same way)
• a few changes to make the reader compatible with a wider variety of tiffs
• a change to metadata in wsireader that fixes some performance issues on some wsis

[Abdol]

After updating the sample OME TIFF, the bug can be reproduced using the existing level consistency tests. So, I have removed the newly-added test. This PR should be good to go now.