Fix EmailTask named-parameter error for associative address arrays

[dereuromark]

Summary

Fixes #471.

EmailTask::run() expanded every mailer setting through call_user_func_array(). Under PHP 8+, string keys in the argument array are interpreted as named parameters, so queued payloads using CakePHP's associative address-map format:

'to' => ['recipient@example.com' => 'Recipient Name']

...failed with Unknown named parameter $recipient@example.com against setTo()/setFrom()/etc.

Fix

Address setters (to, from, cc, bcc, replyTo, plus sender/returnPath) are now handled explicitly before the generic settings loop, consistent with how theme/template/attachments were already special-cased.

A small addressArguments() helper normalizes the value:

• list-shaped arrays (e.g. ['email', 'Name'] or legacy wrapped [['email' => 'Name']]) are unpacked positionally — matching the previous behavior,
• any other shape, including associative email => name maps, is forwarded as a single positional argument so PHP's named-parameter semantics never kick in.

All previously working payload formats continue to work unchanged; the associative map format now also works, matching what Cake\Mailer\Mailer::setTo() natively accepts.

A regression test covers to, from, cc, bcc, and replyTo with associative address maps.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.15%. Comparing base (a534d1f) to head (9e683eb).
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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #472      +/-   ##
============================================
+ Coverage     77.08%   77.15%   +0.07%     
- Complexity      938      944       +6     
============================================
  Files            45       45              
  Lines          3172     3182      +10     
============================================
+ Hits           2445     2455      +10     
  Misses          727      727              

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