Complete PHPStan Level 6 (#5305)

* Complete PHPStan Level 6
Fix https://github.com/FreshRSS/FreshRSS/issues/4112
And initiate PHPStan Level 7

* PHPStan Level 6 for tests
* Use phpstan/phpstan-phpunit
* Update to PHPStan version 1.10

* Fix mixed bug

* Fix mixed return bug

* Fix paginator bug

* Fix FreshRSS_UserConfiguration

* A couple more Minz_Configuration bug fixes

* A few trivial PHPStan Level 7 fixes

* A few more simple PHPStan Level 7

* More files passing PHPStan Level 7
Add interface to replace removed class from https://github.com/FreshRSS/FreshRSS/pull/5251

* A few more PHPStan Level 7 preparations

* A few last details

1 files changed, 19 insertions, 0 deletions

diff --git a/lib/Minz/ConfigurationSetterInterface.php b/lib/Minz/ConfigurationSetterInterface.php
new file mode 100644
index 000000000..ac8c154ba
--- /dev/null
+++ b/lib/Minz/ConfigurationSetterInterface.php
@@ -0,0 +1,19 @@
+<?php
+
+interface Minz_ConfigurationSetterInterface {
+
+	/**
+	 * Return whether the given key is supported by this setter.
+	 * @param string $key the key to test.
+	 * @return bool true if the key is supported, false otherwise.
+	 */
+	public function support(string $key): bool;
+
+	/**
+	 * Set the given key in data with the current value.
+	 * @param array<string,mixed> $data an array containing the list of all configuration data.
+	 * @param string $key the key to update.
+	 * @param mixed $value the value to set.
+	 */
+	public function handle(&$data, string $key, $value): void;
+}