Init Cake5 upgrade.

[dereuromark]

WIP

Missing still:

• Fixtures
• RequestHandler replacement (how?) for auto csv

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (1d5ada1) 95.41% compared to head (c2e539c) 88.13%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 4.x #136 +/- ## ============================================ - Coverage 95.41% 88.13% -7.28% - Complexity 38 40 +2 ============================================ Files 1 2 +1 Lines 109 118 +9 ============================================ Hits 104 104 - Misses 5 14 +9 ``` | [Files](https://app.codecov.io/gh/FriendsOfCake/cakephp-csvview/pull/136?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FriendsOfCake) | Coverage Δ | | |---|---|---| | [src/CsvViewPlugin.php](https://app.codecov.io/gh/FriendsOfCake/cakephp-csvview/pull/136?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FriendsOfCake#diff-c3JjL0NzdlZpZXdQbHVnaW4ucGhw) | `0.00% <ø> (ø)` | | | [src/View/CsvView.php](https://app.codecov.io/gh/FriendsOfCake/cakephp-csvview/pull/136?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FriendsOfCake#diff-c3JjL1ZpZXcvQ3N2Vmlldy5waHA=) | `95.41% <100.00%> (ø)` | |

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[stickler-ci]

I couldn't find a .stickler.yml file in this repository. I can make one for you, or you can create one by following the documentation.