Reset zoom and center on each page

[marlo-longley]

Addresses:
#4217
#4199

• Change default to preserveViewport: false
• Reset zoom and center on each page
• Add a test for OpenSeadragonComponent
• If initialViewerConfig is set, override preserveViewport: false

This is different from the aspect ratio calculation (#4117) and just recalculates the center if the bounds change at all. I'm interested to hear opinions on that -- it was just easier for me to get my head around but might not be what we want.

Behavior resulting from this PR:

• preserveViewport: false: each page resets its zoom and center, including between pages with different bounds/sizes (such as paging from a cover --> 2-page book spread)
• preserveViewport: true: zoom and pan is kept between pages. Re-centering does not occur between pages with different bounds/sizes. If you are zoomed in on a book cover, and then page into a 2-page spread, the spread will be off-center. If you then center the 2-page spread and continue to page forward, the rest of the 2-page spreads will be centered.

Seeking input on:

• initialViewerConfig (to test, see the demo page at https://deploy-preview-4220--mirador-dev.netlify.app/viewer-config) -- now that preserveViewport is actually working, I would love input on this setting. Right now if initialViewerConfig is set and preserveViewport: false (again, this is the new default), the manifest loads the initialConfig, but on paging forward, the views are reset. Is this the intended behavior?

[codecov]

Codecov Report

❌ Patch coverage is 96.77419% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.2%. Comparing base (ff5ec95) to head (e78884b).
⚠️ Report is 24 commits behind head on main.

Files with missing lines	Patch %	Lines
src/state/sagas/windows.js	83.4%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #4220     +/-   ##
=======================================
- Coverage   95.3%   95.2%   -0.0%     
=======================================
  Files        326     326             
  Lines      16200   16220     +20     
  Branches    2555    2569     +14     
=======================================
+ Hits       15423   15440     +17     
- Misses       772     774      +2     
- Partials       5       6      +1     

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