Conditionally installing service workers on registered scripts or offline browsing enabled.

[rutviksavsani]

Fixes: #436

This PR conditionally installs the service worker when there are Service Worker scripts coming from other plugins or if the offline browsing option of the PWA plugin is enabled.

Implementation

pwa-test.Just.another.WordPress.site.mp4

[codecov-commenter]

Codecov Report

Merging #727 (373c0ef) into develop (f6e2a48) will decrease coverage by 0.09%.
The diff coverage is 10.52%.

@@              Coverage Diff              @@
##             develop     #727      +/-   ##
=============================================
- Coverage      18.41%   18.32%   -0.10%     
  Complexity       334      334              
=============================================
  Files             57       57              
  Lines           2270     2303      +33     
=============================================
+ Hits             418      422       +4     
- Misses          1852     1881      +29     

Flag	Coverage Δ
php	18.32% <10.52%> (-0.10%)	⬇️
unit	18.32% <10.52%> (-0.10%)	⬇️

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Impacted Files	Coverage Δ
wp-includes/default-filters.php	0.00% <0.00%> (ø)
wp-includes/service-workers.php	24.19% <100.00%> (+5.22%)	⬆️

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