refactor(cache): extract and encapsulate cache expiration logic (#3547)

* refactor(cache): extract and encapsulate cache expiration logic

* fix: logic bug in getSimpleHTMLDOMCached

* fix: silly me, index should of course be on the key column

* silly me again, PRIMARY keys get index by default lol

* comment out the delete portion in loadData

* remove a few log statements

* tweak twitter cache timeout

caches/NullCache.php

@@ -12,7 +12,7 @@ class NullCache implements CacheInterface
     {
     }
 
-    public function loadData()
+    public function loadData(int $timeout = 86400)
     {
     }
 
@@ -25,7 +25,7 @@ class NullCache implements CacheInterface
         return null;
     }
 
-    public function purgeCache(int $seconds): void
+    public function purgeCache(int $timeout = 86400): void
     {
     }
 }