Hotwired improvements

[jbrichau]

• Fix for turbolinks prefetching in Seaside (disable by default)
• Added turbostream callback to anchors.
• Fix bug causing state not being saved on a show: or call: in turboframes.
• Preliminary functional tests

[codecov]

Codecov Report

Attention: Patch coverage is 5.17241% with 110 lines in your changes missing coverage. Please review.

Project coverage is 49.37%. Comparing base (0f7d6f7) to head (fb1f675).
Report is 26 commits behind head on master.

Files with missing lines	Patch %	Lines
...edTestComponent.class/instance/renderContentOn..st	0.00%	11 Missing ⚠️
...oFunctionalTest.class/instance/renderContentOn..st	0.00%	9 Missing ⚠️
...ctionalTest.class/instance/renderTurboScriptOn..st	0.00%	8 Missing ⚠️
...age/WAMetaElement.class/instance/turboPrefetch..st	0.00%	7 Missing ⚠️
...boTestComponent.class/instance/renderContentOn..st	0.00%	7 Missing ⚠️
...ackage/WABasicFormTag.extension/instance/turbo..st	0.00%	6 Missing ⚠️
.../WABasicFormTag.extension/instance/turboAction..st	0.00%	6 Missing ⚠️
.../WABasicFormTag.extension/instance/turboTarget..st	0.00%	6 Missing ⚠️
...reTurboFunctionalTest.class/instance/initialize.st	0.00%	6 Missing ⚠️
...chorTag.extension/instance/turboStreamCallback..st	0.00%	5 Missing ⚠️
... and 10 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1449      +/-   ##
==========================================
- Coverage   49.42%   49.37%   -0.05%     
==========================================
  Files        9073     9119      +46     
  Lines       80086    80350     +264     
==========================================
+ Hits        39582    39674      +92     
- Misses      40504    40676     +172     

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